Prof. Dr. Yousif M . Y Abdallah | University of Majmaah (original) (raw)

Papers by Prof. Dr. Yousif M . Y Abdallah

Radiation Protection Dosimetry, Jun 9, 2023

The purpose of this study is to look at the variations in chest computed tomography (CT) use, rad... more The purpose of this study is to look at the variations in chest computed tomography (CT) use, radiation dose and image quality in the 2019 novel coronavirus (COVID-19) pneumonia patients in Saudi Arabia. This is a retrospective study of 402 patients with COVID-19, who were treated between February and October 2021. Radiation dose was estimated using metrics of volume CT dose index (CTDIvol) and size-specific dose estimate (SSDE). The imaging performance of the CT scanners was evaluated by measuring different parameters, such as resolution and CT number uniformity, with an ACR-CT accreditation phantom. Expert radiologists assessed the diagnostic quality and occurrence of artefacts. For all of the image quality parameters tested, the majority of the scanner sites (80%) were found to be within the suggested acceptance limits. Ground-glass opacities were the most common finding in our patient sample (54%). On chest CT exams with typical appearance of COVID-19 pneumonia, the most respiratory motion artefacts (56.3%) were present, followed by those with indeterminate appearance (32.2%). There were significant differences in CT utilization, CTDIvol and SSDE across the collaborated sites. The use of CT scans and radiation doses varied in the COVID-19 patients, highlighting the optimizations of CT protocols at participating sites.

Onkologia i Radioterapia, 2020

Background: Precise radiation segmentation of brain tumours is essential for the definition of Gr... more Background: Precise radiation segmentation of brain tumours is essential for the definition of Gross Tumour Volumes (GTVs). For sensitive GTV detection, the most comprehensive data may be provided by MRI images. This study was conducted to delineate malignant brain tumours in radiotherapy patients using image segmentation techniques. Materials and Methods: MRI images of 10 patients with astrocytoma were used in this study. A new method of watershed-based segmentation techniques was used to segment the GTVs (region of interest, ROI) in T1-and T2-weighted MRI images. These techniques were used to delineate the GTVs morphologically and accurately and were compared with manually delineated GTVs. To analyse the segmentation technique quantitatively, the Dice similarity coefficient, sensitivity and segmentation specificity were calculated. The images were processed with the MATLAB image processing toolbox. In MRI images, brain tumours can be easily detected if the objects have a sufficient contrast background. Results: The experimental study and the new method achieved quality segmentation, Dice similarity coefficient, sensitivity and specificity values of 0.92 ± 0.09, 0.86 ± 0.03, 0.94 ± 0.06 and 0.90 ± 0.09, respectively, were achieved. For GTV volume segmentation, image detection and filter morphology were conducted by reading the image, completing brain detection, image dilation, image filling, edge removal, and brain smoothing. This study led to an alternative way of showing an object in a divided brain. This method can help remove unwanted background information and improve diagnosis via brain MRI. Conclusion: The new watershed segmentation method allows the semiautomatic segmentation of GTVs. Anatomical and functional MRI images can create a new way to identify radiation therapy goals and methods.

Archives of Medicine and Health Sciences, 2017

Nowadays, millions of studies perform daily around the world. Medical imaging developed throughou... more Nowadays, millions of studies perform daily around the world. Medical imaging developed throughout for >100 years. It is used to visualize the different body structure and the functional activities. This information is useful in judgment and management of different pathological conditions. This study aimed to study the historical development of medical imaging modulates. The new technologies decrease the radiation dose to the least levels.

Journal of Biomedical Engineering and Medical Imaging, Feb 28, 2020

The Quality Control (QC) system, based on simple, cheap equipment and minimum personnel time, ena... more The Quality Control (QC) system, based on simple, cheap equipment and minimum personnel time, enables a resource-limited facility and staff to control the fundamental components of the imaging process on a low cost basis. Quality Assurance (QA) is a product or service quality management program. Customer reviews, capacity building and quality control can also be included. Quality control requires specific measures for ensuring measurable process-related aspects of product output or for the delivery of services within a given limit. Research was conducted at the Medical Physics Department of Red Sea University. The main objective of this work was to boost quality assurance rays. The imagination is more user-friendly and produces better results than a person or object. Phantoms, including fluoroscopy or xrays, and certain image quality measurements have been used in x-rays imaging. The manufactured phantom in this study showed high precision in different QC tests.

Biomedical Research-tokyo, 2019

Background: Chest trauma or chest injury is a kind of injury to chest that leads to life threaten... more Background: Chest trauma or chest injury is a kind of injury to chest that leads to life threatening impact. Radiation imaging is used for trauma assessment, treatment and monitoring. Objectives: The purpose of this study was to estimate of the radiation dose received in chest x-rays for traumatic patients in the Majmaah area and matched the results nationally and internationally. Furthermore, it aims to determine the reference radiation dose for chest x-rays. Methods: Sample of 160 patients were evaluated at radiology department of King Khaled Hospital-Majmaah, Saudi Arabia. The average patient age for adults was 34.5 ± 12.9 with the range of (18-80) (years) and for pediatric patients was 7.6 ± 2.5 with range of (1-16) years. The average and range of exposure parameters were 72.8 ± 8.3 (81.8-124.9) and 1.5 ± 0.9 (0.3-2.5) for X-ray tube potential (kVp) and current multiplied by the exposure time(s) (mAs), respectively. Results: The measured dose for adult patients were (0.20 ± 0.07 (0.13-0.37) and 0.24 ± 0.1 (0.06-0.74) for female and male respectively. The measured dose for pediatric patients were (0.20 ± 0.07 (0.13-0.37) and 0.18 ± 0.03 (0.06-0.23) for female and male respectively. Conclusion: The study was revealed that 90% of the chest x-rays exposures with normal dose levels. However, precise justification is required, especially for young patients.

Current Medical Imaging Reviews, Mar 22, 2023

Background: The study was conducted on patients who received diagnostic X-rays in King Khalid Hos... more Background: The study was conducted on patients who received diagnostic X-rays in King Khalid Hospital (KKH), Majmaah. background: The study included the seven most frequently performed investigations which were done on over 1504 patients using digital radiography equipment. Introduction: The study included the seven most frequently performed investigations, which were carried out on over 1504 patients using digital radiography equipment. Methods: The X-ray tube's output and exposure parameters were used to calculate the effective dose (ED) and patient entry surface air kerma (ESAK). Additionally, based on these results, conversion coefficients were determined. This study also examined the 75th percentile distributions of ESAK and KAP. The findings of this research were compared with the findings of other researchers throughout the country and the world. The study presents the uncertainty U values, as well as the mean ESAK, KAP, and ED values. method: The X-ray tube's output and exposure parameters were used to calculate the effective dose (ED) and patient entry surface air kerma (ESAK). Additionally, based on these results, conversion coefficients were determined. This study also examined the 75th percentile distributions of ESAKS and KAP. The findings of this research were compared the findings to those of other researchers from throughout the country and the world. The study presents the uncertainty U values, as well as the mean ESAK, KAP, and ED values. Results: The results of the ESAK, KAP, and ED values were 0.12-5.74 mGy, 0.9-1.84 Gy cm2, and 0.01-0.23 mSv, respectively. As a result, the dosages were much lower than those previously published for the European DRL, national standards, and other studies. Conclusion: The study concludes that during dose surveys, the importance of detecting and comprehending radiation doses, as well as the proper technique for taking the finest photos possible, can be emphasized to patients in order to assist them in avoiding radioactive particles and radiation exposure. conclusion: The study concludes that during dose surveys, the importance of detecting and comprehending radiation doses, as well as the proper technique for taking the finest photos possible, can be emphasized to patients in order to assist them in avoiding radioactive particle and radiation exposure.

Imaging in Medicine, 2021

Background: Nuclear cardiology can detect both ischemia and inflammation of the heart. It's diffi... more Background: Nuclear cardiology can detect both ischemia and inflammation of the heart. It's difficult to distinguish adjacent tissues in a cardiac scintography image. Objectives: The aim of the study is to characterize of myocardium anomalies using watershed-based segmentation approaches in nuclear cardiology. The researchers seek to detect heart tissue in nuclear medicine pictures by using watershed methods. The contrast is blurred, and the presence of fleck noise complicates interpretation. Methods: Thus, color-based image processing can considerably boost the rate of cardiac detection in digital image processing. This study employed color-based k-means clustering. Color space conversion was carried out using scintographs. Following that, using color analysis tools, the image was segmented. Results: On exhibit was an altogether new and crystal-clear rendition of the segmented scintograph. The proposed method precisely defines the cardiac tissues and their borders. We calculated both the accuracy rate and the recall reckoning. 98.9+9.01 (p>0.05) and 0.07+0.004 (p>0.05) were the results. Conclusion: The proposed approach is used to identify cardiac tissue precisely.

Journal of Research in Medical and Dental Science, Feb 1, 2020

Background: Radiation exposure is the main hazard in medical X-ray investigations. The aim of thi... more Background: Radiation exposure is the main hazard in medical X-ray investigations. The aim of this study was to evaluate the radiation dose received in chest x-rays for trauma patients in the Majmaah area. The results were compared with other national and international findings. Furthermore, the reference radiation dose level was measured for different examinations by conventional x-rays. Thus, conventional X-ray examination of trauma patients was investigated. Materials and Methods: Seven hundred patients were evaluated at King Khalid Hospital, Majmaah. The average and range of exposure parameters were 73.5 ± 9.1 (65.9-124.9) and 2.7 ± 0.71 (0.2-9.6) for X-ray tube potential (kVp) and current multiplied by the exposure time (s) (mAs), respectively. Results: The entrance surface air kerma dose measured for chest (PA), skull (AP and LAT), lumbosacral (AP and LAT), and knee joint (AP and LAT) were 0.20+0.07 with a range of 0.13-0.37, 0.86 ± 0.01 with a range of 0.09-2.92 and 0.09 ± 0.02 with a range of 0.04-0.17, 0.10 ± 0.02 with a range of (0.04-0.17 and 0.1 ± 0.02 with a range of 0.03-0.16, and 0.86 ± 0.01 with a range of 0.09-2.92, respectively. The measured doses for pediatric patients were 0.20 ± 0.07 (0.13-0.37) and 0.18 ± 0.03 (0.06-0.23) for female and male patients, respectively. Conclusion: It was concluded that 90% of the procedures had normal findings. However, a precise justification is required, especially for young patients. For dose measurement techniques, the machine-and patient-related factors must be fixed in order to obtain accurate results.

The computed tomography has huge role in the assessment of the hemorrhagic lesions of the brain. ... more The computed tomography has huge role in the assessment of the hemorrhagic lesions of the brain. Physicians widely use CT to delineate the size and magnitude of the bleeding. In the medical image processing, the separation and detection of the objects is very crucial issue. The water-based segmentation (subdivision) is an approach that use to detect the closely contact margins tissues within the images. Manual outlining of the stroke in CT images considers as subjective operation that takes long time with less accuracy. In this study, the lesions were detected firstly and followed by Contrast augmentation and Segmentation. The suggested technique was evaluated to endorse its achievability and efficiency. These techniques attained 0.97 + 0.01, 0.98 + 0.02 and 0.991 + 0.01 (P = 0.001) for sensitivity, specificity and operating curve analysis, respectively. The analysis of the results images showed that the proposed approach is effective in detecting of the smaller lesions which might missed by using other segmentation methods. (Abstract)

Open Access Macedonian Journal of Medical Sciences, Nov 29, 2021

BACKGROUND: Nuclear cardiology uses to diagnose the cardiac disorders such as ischemic and inflam... more BACKGROUND: Nuclear cardiology uses to diagnose the cardiac disorders such as ischemic and inflammation disorders. In cardiac scintigraphy, unraveling closely adjacent tissues in the image are challenging issue. AIM: The aim of the study is to detect of cardiac tissues using K-means analysis methods in nuclear medicine images. This study also aimed to reduce the existence of fleck noise that disturbs the contrast and make its analysis more difficult. METHODS: Thus, digital image processing uses to increase the detection rate of myocardium easily using its color-based algorithms. In this study, color-based K-means was used. The scintographs were converted into color space presentation. Then, each pixel in the image was segmented using color analysis algorithms. RESULTS: The segmented scintograph was displayed in distinct fresh image. The proposed technique defines the myocardial tissues and borders precisely. Both exactness rate and recall reckoning were calculated. The results were 97.3 + 8.46 (p > 0.05). CONCLUSION: The proposed technique offered recognition of the heart tissue with high exactness amount.

Journal of Biomedical Engineering and Medical Imaging, Oct 31, 2018

Ultrasound consider of one of the most important tool in analysis of fetus development. In ultras... more Ultrasound consider of one of the most important tool in analysis of fetus development. In ultrasound images, the recognition closely adjacent tissues is very crucial process because of the noise that affected both image quality and sharpness. This study conducted to study the fetus images improvement using HAT-TOP transform as computing choice in order to increase the diagnostic accuracy in diagnosis of neonatal diseases. Many image-processing techniques were used to improve the images including Using HAT-TOP and Blind Deconvolution Algorithm. The results of the study showed HAT-TOP was best processing filter and define the fetus precisely.

Radioprotection, Sep 21, 2022

Anthropomorphic phantoms, which can provide equivalent human tissue densities, are one of the bes... more Anthropomorphic phantoms, which can provide equivalent human tissue densities, are one of the best solutions for verifying the quality of radiotherapy treatment plans produced by treatment planning systems. The goal of this work was to develop and fabricate a breast phantom to estimate radiation doses to the breast, lung, and surface using radiochromic films (EBT3) for basically two techniques of three-dimensional conformal radiotherapy (3D-CRT) treatment planning. Thirty-two acrylic slices were used to construct the phantom. Cork and Teflon were used to mimic the lung and bone, respectively. Four slots were drilled for dosimetry purposes to allow access to the areas of ionization chamber installation. Both wedged and open of two tangential beams techniques were applied. With a mean deviation of 1.02 ± 1.1, the variation between estimated point doses and measurements using the three ionization chambers ranged from 2.9 to 1.4%. Using 0, 5 and 10 mm boluses, the mean percentage doses on the target surface were 54.7, 88.6 and 91.7% of the prescribed dose (PD), respectively. The homemade phantom was appropriate for conducting quality control (QC) tests for 3D-CRT planning techniques for breast radiotherapy.

IntechOpen eBooks, Apr 14, 2021

Cross-sectional imaging approaches play a key role in assessing bleeding brain injuries. Doctors ... more Cross-sectional imaging approaches play a key role in assessing bleeding brain injuries. Doctors commonly determine bleeding size and severity in CT and MRI. Separating and identifying artifacts is extremely important in processing medical images. Image and signal processing are used to classify tissues within images closely linked to edges. In CT images, a subjective process takes a stroke 's manual contour with less precision. This chapter presents the application of both image and signal processing techniques in the characterization of Brain Stroke field. This chapter also summarizes how to characterize the brain stroke using different image processing algorithms such as ROI based segmentation and watershed methods.

Journal of Research in Medical and Dental Science, 2021

X-ray diagnostic tests are important for public health. Such tests may involve significant patien... more X-ray diagnostic tests are important for public health. Such tests may involve significant patient irradiation and may be the population's largest radiation source. X-ray mammograms show different female lesions using ionizing radiation. The result is exposure to a small amount of increased radiation. This study was performed during mammograms to determine the average absorbed dose of x-rays and factors influencing the breast 's median glandular dose (MGD). The study was conducted in Khartoum, Sudan, mammography patients. Sample size was 300 patients with different disease types. This study was in two Khartoum Hospitals. This study evaluated Robson's Mean Glandular Dose (MGD) and additional mammographic dance tests. Patient age, breast thickness, tube filter and exposure factors (mAs and kVp) were study parameters. Calculated MGD results show that patient exposure was significantly lower than standard IAEA dose. For Craniocaudal and Oblique projections, the average MGD values were 1.54 + 0.17 (p<.05) and 1.58 + 0.22 (p<0.05). This study documented patient characteristics and radiation exposure factors. For international agencies (IAEA, NCRP and ACR), these results should be less than the standard dose.

Radiation Protection Dosimetry, Jul 24, 2022

Size-specific dose estimate (SSDE), which can be calculated by measuring the effective diameter (... more Size-specific dose estimate (SSDE), which can be calculated by measuring the effective diameter (De) or water equivalent diameter (Dw) of the patient, is one of the recent approaches for verifying the individual doses during computer tomography (CT) examinations. This work aimed to compare the Dw estimated by the AutoWED tool and IndoseCT software and to investigate CT axial (ARH) and paediatric head (PH) protocols used in southern Saudi Arabia to calculate the dose received by paediatric patients using metrics of volume CT dose index (CTDIvol) and SSDE. The distribution between the ARH and PH protocols was 57.8 and 42.2%, respectively. There was no significant difference in Dw values between the AutoWED tool and the IndoseCT program (0.13%). Including CT table or other objects during estimation of Dw can lead to variation up to 11.4%. The impact of selecting IndoseCT options to identify the border of the patient may be part of the explanation for these variations. A strong linear relationship was obtained between De and Dw in paediatric head size (R2 = 0.96). Using IndoseCT, for 0–1.5, 1.5–5 and 5.0–18 age groups (years), the Dw was found to be 13.2, 15.3 and 16.8 cm, respectively. The SSDE for the PH protocol was substantially lower than that of the ARH protocol. As a result, education of the individuals engaging in paediatric CT examinations is necessary for dose optimization.

Radiation Physics and Chemistry

Background: Medical imaging uses to clinical evaluation of the dental anatomy and pathology. Bill... more Background: Medical imaging uses to clinical evaluation of the dental anatomy and pathology. Billions of images are performed globally. Imaging processing technique is used for helping accuracy of diagnosis by increasing the image quality. The dental images consider as a simple mixture of (unwanted) background information, diagnostic information, and noise. Aim: This paper is performed to enhance the dental images quality by denoising and detecting the dental structures. Materials and methods: This study design is experimental study done on dental images who are preliminarily diagnosed as having different oral diseases and is focused on using the image processing techniques to enhance the image quality of dental x-rays (OPG and Periapical) A convenience sampling was done and dental images were collected and then were treated by using MatLab program. Data analysis was done by using MatLab and statistical analysis was done by measuring precision and recall computation frame. Results: ...

Current Medical Imaging Reviews, 2018

Radiation Exposure is the main hazard in medical x-rays investigations. The objective of this wor... more Radiation Exposure is the main hazard in medical x-rays investigations. The objective of this work was to study the attended radiation dose measured in the Majmaah area. Furthermore, to measure the radiation dose level for different examinations in conventional x-rays. Thus, conventional x-rays examination of traumatic patients. A sample of 700 patients was evaluated using at King Khaled HospitalMajmaah. The average and range of exposure parameters were 73.5 ± 9.1 (65.9 – 124.9) KVp and 2.7 ± 0.71 (0.2 – 9.6) mAs for X-ray exposure factors, respectively. The measured Entrance Surface Air Kerma (ESAK) dose for chest (PA), skull ((AP) and (LAT.)), Lumbosacral ((AP) and (LAT.)) In addition, knee joints ((AP) and (LAT.)) were 0.20 + 0.07 with range of (0.13-0.37) mGy, (0.86 ± 0.01) with range of (0.09 – 2.92) mGy and 0.09 + 0.02 with range of (0.04 -0.17) mGy, (0.10 ± 0.02 with range of (0.04 – 0.17) mGy and 0.1 + 0.02 with range of (0.03 -0.16) mGy and 0.86 ± 0.01 with range of (0.09 –...

Radiation Protection Dosimetry, Jun 9, 2023

Onkologia i Radioterapia, 2020

Archives of Medicine and Health Sciences, 2017

Journal of Biomedical Engineering and Medical Imaging, Feb 28, 2020

Biomedical Research-tokyo, 2019

Current Medical Imaging Reviews, Mar 22, 2023

Imaging in Medicine, 2021

Journal of Research in Medical and Dental Science, Feb 1, 2020

Open Access Macedonian Journal of Medical Sciences, Nov 29, 2021

Journal of Biomedical Engineering and Medical Imaging, Oct 31, 2018

Radioprotection, Sep 21, 2022

IntechOpen eBooks, Apr 14, 2021

Journal of Research in Medical and Dental Science, 2021

Radiation Protection Dosimetry, Jul 24, 2022

Radiation Physics and Chemistry

Current Medical Imaging Reviews, 2018

Organs motion in Radiotherapy induce an error in the dose received by the tumor. Therefore, this ... more Organs motion in Radiotherapy induce an error in the dose received by the tumor. Therefore, this book has been published to evaluate the organs motion during external beam radiotherapy. It deals with the detection, measurement and analysis of the periodic physiological organs motion during external beam radiotherapy. During a fractionated course of radiotherapy, variations in patient position and in the alignment of beams will occur both intra- and inter-fractionally, and a margin for set-up error must be incorporated into the CTV-PTV margin. Errors maybe systematic or random. Systematic errors may result from incorrect data transfer from planning to dose delivery, or inaccurate placing of devices such as compensators, shields, etc. Such systematic errors can be corrected. On the other hand, random errors in set-up maybe operator dependent, or result from changes in patient anatomy from day to day, which are impossible to correct.

This book was produced to answer the need expressed by Radiologists and trainee Radiology Technol... more This book was produced to answer the need expressed by Radiologists and trainee Radiology Technologists for clear and detailed description of the PACS and its uses in Radiology service. The concept of picture Archiving and Communication System (PACS) has now been in existence for over 20 years. Advances in computer hardware technology only enabled it to become a realistic clinical entity in the 1990s. PACS installations are now rising exponentially worldwide, and although most institutions with PACS have achieved a completely filmless working environment, few function in a paperless mode. PACS integrates imaging modalities, interfaces with hospital and departmental information systems, and manages the acquisition, storage, retrieval, and display of images to radiologists, hospital physicians, and remote referring physicians, specialists, clinics and imaging centers. PACS serves as a secure database for medical images, but more importantly, PACS improves the efficiency of imaging departments.

This book was produced to answer the need expressed by dental physicians, dental surgeons and rad... more This book was produced to answer the need expressed by dental physicians, dental surgeons and radiology technologists for a clear and detailed description of the application of analysis approach in noise estimation using one of image processing programs. The issue of whether the dentist should use the radiographs in diagnosis or delegate this task to the radiographic technologist must be tackled responsibly for achieving radiographic quality and accurate radiation dose. This book also presents a new approach for Independently Identically Distributes (IID) noise in panoramic images and reduction of the redundancy in the image data using image processing technique. In addition, it highlights the role of the proposed approach (Noise Variance) by preservation of the image's overall look, preservation of the diagnostic content in the image, detection of small and low contrast details in the diagnostic content of the image. Furthermore, it highlights the role of using image processing technique in Radiology.

Since the beginning of Radiation Therapy, the Radiation Mold Technology has continued to develop.... more Since the beginning of Radiation Therapy, the Radiation Mold Technology has continued to develop. It continues to find new applications, most notably, so far as mold technology, in the development of delivery a homogenous dose of radiation to an accurately localized target volume in order to produce tumor control with minimal effect on surrounding normal tissues. Mold technology itself has also moved forward. No self-respecting mold room will now wish to be seen without Simple or complex immobilization devices and even automatic Styrofoam cutters are to be found in some departments. The automatic Styrofoam offers real advantages for lead blocks cutting. The manual Styrofoam is now supplanted by fully digital approaches, offering the advantage of greater reliability and the ability to handle accurate foam cutting. Radiation Mold Technology's role in Radiotherapy is increasing, for example in immobilization of the affected part of the patient, Localization to assess the size and relationship of the tumor volumes to the skin, Protection of vital structures adjacent to the tumor volume and Reproducibility of treatment technique.

This book was produced to answer the need expressed by trainee medical physicists and radiotherap... more This book was produced to answer the need expressed by trainee medical physicists and radiotherapy technologists for clear and detailed description of the verification of light and radiation field in Radiotherapy machines. The importance of this book is to highlight the Sufficiency of the application of image processing methods in the field of radiotherapy machines (Telecobalt and Linear acceralator). In addition to its role to objectively score the alignment of the photon field that is unable to detect by naked eye special in megavoltage machines. Details of the techniques used vary in the image processing programs such as (e.g. Matlab, IDL .etc.) from center to another. Any trainee medical physicists and Radiotherapy technologists will soon learn those variation, but I hope that, using my book and work, sometimes unavoidably, unsupervised, they would be able to produce adequate results of test.

The aim of radiotherapy treatment is to deliver a homogenous dose of radiation to an accurately l... more The aim of radiotherapy treatment is to deliver a homogenous dose of radiation to an accurately localized target volume in order to produce tumor control with minimal effect on surrounding normal tissue. This study describes the technology and methods involved in a system for automatically checking the position of patients at radiotherapy units. The patient Alignment and position monitoring is carried out by comparing the current laser positions of the markers with those of an initial reference position acquired during the simulation procedure and/or the first irradiation session. The study was performed to measure the accuracy of conventional laser centering techniques for patient repositioning. Inaccuracies due to breathing and random movements were also taken into account. Professional radiotherapy technicians were asked to reposition twenty patients carefully using traditional laser centering procedures. The results revealed significant repositioning errors even in highly controlled conditions, affecting particularly body areas relatively far from the skin reference points used for laser alignment. The outcome of the experimental application of it confirms its potential as a tool for patient repositioning and automatic detection of any errors caused by breasting or other unpredictable movements. The results allow the radiotherapy technicians to take suitable countermeasures in case of significant errors (Conventional Set-up is equally (5.0+0.3 mm) for x-direction reading, 1.5+0.2 mm (x-direction reading) and 2.0+0.3 mm and Laser Reading is equal 3.5+0.4 mm, 0.5+0.1 mm, 1.5 +0.3 mm). In addition, the use of the laser beam for automatic position control is envisaged.