J. Szanto - Profile on Academia.edu (original) (raw)

Papers by J. Szanto

PD-0036 Optimized Output Factor Measurement Method for Cyberknife Collimators

Radiotherapy and Oncology, 2012

than 10 mm. Our approach is to develop a phantom that contains an embedded array of plastic scint... more than 10 mm. Our approach is to develop a phantom that contains an embedded array of plastic scintillators coupled to square air core light guides. The prototype array allows for accurate verification of fields as small as 4 mm, with high spatial and temporal resolution and without the need for correction factors. Materials and Methods: The 16 element linear array was constructed from custom cut PMMA sheets. Plastic scintillation detectors (BC400) of volume 0.8 mm3 were placed in 1 x 1 mm silvered square air core waveguides to avoid the production of a Cerenkov background signal in the primary field. The 16 detector elements have a center-tocenter spacing of 2 mm and an edge-to-edge distance of 1 mm and provide high resolution profiles of small treatment fields and of high dose gradients.Scintillation light from the air core array was measured with a photomultiplier tube (PMT) array detector, enabling measurements with high temporal resolution (10 Hz). This scintillation light readout system and user interface software was optimized for clinical use.The array was placed in a water equivalent medium in order to measure the beam output factors, percentage depth dose and beam profiles of radiation fields produced by a Varian Novalis TX linac. The array was then displaced laterally three times for measuring the beam profile, increasing the array's spatial resolution to 0.5 mm. Results: The PMMA light guides of 1 mm square cross section and 180 mm length show 5 times more light transmission than the previously used circular light guides of 1 mm diameter of the same length. The dose measurements were compared to those measured using a single air core dosimeter and other commercially available dosimeters. This experimentally confirms the suitability of the air core array for small field dosimetry with no corrections needed for angular dependence or dose perturbation as currently required by commercial arrays.

$Research paper thumbnail of 92 Treatment planning comparison of fractionated stereotactic radiotherapy, 3D conformal radiotherapy, and helical tomotherapy for benign tumours in the base of skull$

92 Treatment planning comparison of fractionated stereotactic radiotherapy, 3D conformal radiotherapy, and helical tomotherapy for benign tumours in the base of skull

Radiotherapy and Oncology, 2006

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[Radiation sensitivity testing and late neurological complications following radiosurgery for AVM: the use of SF2 from fibroblasts as a predictive factor]

Cancer radiothérapie : journal de la Société française de radiothérapie oncologique, 2003

To identify SF2 as a prognostic factor of late complications from radiosurgery in patients treate... more To identify SF2 as a prognostic factor of late complications from radiosurgery in patients treated for AVM. Five patients with AVM treated in three canadian institutions and who suffered clinically significant neurological sequelaes secondary to radiosurgery were identified. Their fibroblasts were cultured and their radiation sensitivity tested to determine the SF2 for each patient. Patients who developed a neurological complication from radionecrosis, secondary to radiosurgery had an SF2 different than the two control patients with AVM and no complications and also from a group of five cancer patients without late radiation complications (P = 0.005). Radiosurgery is an elective procedure. The identification of a subgroup of patients who are radiosensitive and at a higher risk of radiation induced complications can allow the treatment team to reduce the risk of such complications. SF2 as a new predictive factor should be incorporated in predictive models of risk from treatment of AV...

450A vision based patient position monitoring tool

Radiotherapy and Oncology, 1996

Stat View Version 4.0

Trends in Food Science & Technology, 1993

A translating-bed technique for total-body irradiation

Physics in Medicine and Biology, 1994

Lateral electron equilibrium and electron contamination in measurements of head-scatter factors using miniphantoms and brass caps

Medical Physics, 1995

A safe method of analysis for mechanical damage in spherical radioactive sources used in remote afterloading brachytherapy devices

Medical Physics, 1993

Sci-PM Fri - 09: Image analysis of inter-leaf radiation leakage, a new approach to the correction of EPID mechanic inconsistencies

Medical Physics, 2005

SU-E-T-578: A Dual Detector Method for Determining CyberKnife Total Scatter Factors (TSF)

Medical Physics, 2011

Technique for Using Dynamic CT Angiography (dCTA) for Frameless Stereotactic Radiosurgical (SRS) Planning of Intracranial Arteriovenous Malformations (AVM)

International Journal of Radiation Oncology*Biology*Physics, 2012

Customized Head Cushions Reduce Patient Movement During Intracranial Radiosurgery

International Journal of Radiation Oncology*Biology*Physics, 2012

2252 Application of MOSFET radiation detector for patient dosimetry

International Journal of Radiation Oncology*Biology*Physics, 1996

Asymmetric jaw arc technique for posterior pharyngeal wall and retropharyngeal space tumors

International Journal of Radiation Oncology*Biology*Physics, 1992

A prospective comparison of 3 systems of patient immobilization for prostate radiotherapy

International Journal of Radiation Oncology*Biology*Physics, 1998

Respiratory-induced prostate motion: quantification and characterization

International Journal of Radiation Oncology*Biology*Physics, 2000

Translation method for total body irradiation design and dosimetry

International Journal of Radiation Oncology*Biology*Physics, 1992

Respiratory variation in prostate position: Considerations for conformal radiotherapy treatment planning

International Journal of Radiation Oncology*Biology*Physics, 1998

Effects of rectal barium opacification on prostate position: Considerations for radiotherapy treatment planning of prostate carcinoma

International Journal of Radiation Oncology*Biology*Physics, 2000

A prospective comparison of three systems of patient immobilization for prostate radiotherapy