Gerald Aben - Academia.edu (original) (raw)
Papers by Gerald Aben
Journal of Applied Clinical Medical Physics, Sep 1, 2015
The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarke... more The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarker to improve the characterization of suspicious breast lesions. Study lesions consisted of a total of 60 malignant tumors (BI-RADS 6) and 62 suspicious lesions (BI-RADS 4 or 5). The biopsies of these suspicious lesions resulted in a total of 30 malignant tumors and 32 benign lesions, respectively, yielding a 48.4% positive predictive value (PPV) of the biopsies. The mean and standard deviation of the lesion WO volume fraction of these 60 BI-RADS 6 malignant tumors were first computed to establish a 99% sensitivity threshold value for malignant tumors, and then the biomarker was used to characterize the suspicious lesions. Using the biomarker would characterize all the malignant tumors as malignant, 12 out of the 32 benign lesions as benign, potentially resulting in a 24% improvement rate in the PPV of the biopsies (from 48.4% to 60%) and consequently a 22.5% reduction rate in the false-positive rate of benign biopsies (from 51.6% to 40%). The lesion WO volume fraction biomarker could improve the computer-based assessment of breast MRI by increasing the PPV of breast biopsies and reducing the number of unnecessary biopsies without compromising sensitivity.
Journal of osteopathic medicine, Oct 1, 1998
International Congress Series, Jun 1, 2004
Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Depa... more Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Department. Enhancing workflow efficiency is especially critical given the current staffing levels of radiologists and radiology technical personnel. Our observation is that one factor that plays an increasingly important role in the adverse effect on technologist productivity is the availability of the supervising radiologist for consultation. Communication patterns were evaluated in our department. Based on our observation, it was determined that a more efficient mechanism of communication was necessary in order to reduce radiologists and technologists time commitments. It was determined that an online, internet-based communication system would be more valuable than a telephony-based system. An integrated communication system was identified and installed in the digital mammography setting. The time required for completion of diagnostic digital mammograms both without and with the communication system was evaluated. Technologist travel time was also evaluated. The impact of the integrated communication system was immediately noted by the technologists. A time saving of between 1.2 and 2.1 min was noted. An annual saving in technologist time of between 3 and 5 days could be realized. An improvement in patient care was noted. D 2004 CARS and Elsevier B.V. All rights reserved.
Radiology, 2000
To use a standardized set of chest radiographs to quantify interobserver differences and to provi... more To use a standardized set of chest radiographs to quantify interobserver differences and to provide a basis for comparing the diagnostic performance of physicians. A standardized set of 60 chest radiographs was presented to 162 study participants. Each participant reviewed the radiographs and recorded his or her diagnostic impression by using a fixed five-point scale. These response data were used to generate receiver operating characteristic curves and to establish performance benchmarks. The variations in performance were tested for statistical significance. Significant interobserver variability was identified during these assessments. The composite group of board-certified radiologists demonstrated performance superior to that of the radiology residents and nonradiologist physicians. By using a receiver operating characteristic approach and a standardized set of chest radiographs, observer accuracy and variability are easily quantified. This approach provides a basis for comparing the diagnostic performance of physicians. When value is measured as a diminution in uncertainty, board-certified radiologists contribute substantial value to the diagnostic imaging system.
International journal of technology assessment in health care, 1992
International journal of technology assessment in health care, 1992
A demonstration of appearance and union times of three shoulder ossification centers in adolescen... more A demonstration of appearance and union times of three shoulder ossification centers in adolescent and post-adolescent children
Radiology, 2000
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Journal of applied clinical medical physics / American College of Medical Physics, 2015
The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarke... more The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarker to improve the characterization of suspicious breast lesions. Study lesions consisted of a total of 60 malignant tumors (BI-RADS 6) and 62 suspicious lesions (BI-RADS 4 or 5). The biopsies of these suspicious lesions resulted in a total of 30 malignant tumors and 32 benign lesions, respectively, yielding a 48.4% positive predictive value (PPV) of the biopsies. The mean and standard deviation of the lesion WO volume fraction of these 60 BI-RADS 6 malignant tumors were first computed to establish a 99% sensitivity threshold value for malignant tumors, and then the biomarker was used to characterize the suspicious lesions. Using the biomarker would characterize all the malignant tumors as malignant, 12 out of the 32 benign lesions as benign, potentially resulting in a 24% improvement rate in the PPV of the biopsies (from 48.4% to 60%) and consequently a 22.5% reduction rate in the false-p...
Journal of Forensic Radiology and Imaging, 2015
It is well known that appearance and union times of epiphyseal/apophyseal elements can be used as... more It is well known that appearance and union times of epiphyseal/apophyseal elements can be used as a tool to estimate age in both living and deceased children. Radiographic documentation of ossification centers within the shoulder region however remains underexplored. This study fills that niche by recording the appearance and, or, union times of the proximal humerus, acromial process and coracoid angle/apex. Shoulder radiographs from 264 males and 189 females between the ages of 10 and 21 years were examined. These images were obtained via two sources including the Michigan State University's Clinical Center as well as Query Patricia, an online juvenile radiographic database. Developmental progress of each element was divided into a unique staging system based on the extent to which that center could be visualized. Observations were recorded for each of the three elements and their age/ phase distributions are provided. A number of developmental milestones (phases) were observed to always occur before the age of 16 or 18 years. These results suggest that the shoulder region may be of particular value when evaluating the likely direction of an individual's age in relation to either of these two common threshold values.
International Congress Series
Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Depa... more Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Department. Enhancing workflow efficiency is especially critical given the current staffing levels of radiologists and radiology technical personnel. Our observation is that one factor that plays an increasingly important role in the adverse effect on technologist productivity is the availability of the supervising radiologist for consultation. Communication patterns were evaluated in our department. Based on our observation, it was determined that a more efficient mechanism of communication was necessary in order to reduce radiologists and technologists time commitments. It was determined that an online, internet-based communication system would be more valuable than a telephony-based system. An integrated communication system was identified and installed in the digital mammography setting. The time required for completion of diagnostic digital mammograms both without and with the communica...
The Journal of the American Osteopathic Association, 1998
Journal of the American College of Radiology, 2009
Objective: Women are underrepresented in radiology. The aim of this study was to measure first-ye... more Objective: Women are underrepresented in radiology. The aim of this study was to measure first-year medical students' level of interest in radiology and their attitudes toward factors that could affect residency specialty choices to further understand how to recruit women into radiology careers.
Journal of Applied Clinical Medical Physics, Sep 1, 2015
The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarke... more The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarker to improve the characterization of suspicious breast lesions. Study lesions consisted of a total of 60 malignant tumors (BI-RADS 6) and 62 suspicious lesions (BI-RADS 4 or 5). The biopsies of these suspicious lesions resulted in a total of 30 malignant tumors and 32 benign lesions, respectively, yielding a 48.4% positive predictive value (PPV) of the biopsies. The mean and standard deviation of the lesion WO volume fraction of these 60 BI-RADS 6 malignant tumors were first computed to establish a 99% sensitivity threshold value for malignant tumors, and then the biomarker was used to characterize the suspicious lesions. Using the biomarker would characterize all the malignant tumors as malignant, 12 out of the 32 benign lesions as benign, potentially resulting in a 24% improvement rate in the PPV of the biopsies (from 48.4% to 60%) and consequently a 22.5% reduction rate in the false-positive rate of benign biopsies (from 51.6% to 40%). The lesion WO volume fraction biomarker could improve the computer-based assessment of breast MRI by increasing the PPV of breast biopsies and reducing the number of unnecessary biopsies without compromising sensitivity.
Journal of osteopathic medicine, Oct 1, 1998
International Congress Series, Jun 1, 2004
Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Depa... more Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Department. Enhancing workflow efficiency is especially critical given the current staffing levels of radiologists and radiology technical personnel. Our observation is that one factor that plays an increasingly important role in the adverse effect on technologist productivity is the availability of the supervising radiologist for consultation. Communication patterns were evaluated in our department. Based on our observation, it was determined that a more efficient mechanism of communication was necessary in order to reduce radiologists and technologists time commitments. It was determined that an online, internet-based communication system would be more valuable than a telephony-based system. An integrated communication system was identified and installed in the digital mammography setting. The time required for completion of diagnostic digital mammograms both without and with the communication system was evaluated. Technologist travel time was also evaluated. The impact of the integrated communication system was immediately noted by the technologists. A time saving of between 1.2 and 2.1 min was noted. An annual saving in technologist time of between 3 and 5 days could be realized. An improvement in patient care was noted. D 2004 CARS and Elsevier B.V. All rights reserved.
Radiology, 2000
To use a standardized set of chest radiographs to quantify interobserver differences and to provi... more To use a standardized set of chest radiographs to quantify interobserver differences and to provide a basis for comparing the diagnostic performance of physicians. A standardized set of 60 chest radiographs was presented to 162 study participants. Each participant reviewed the radiographs and recorded his or her diagnostic impression by using a fixed five-point scale. These response data were used to generate receiver operating characteristic curves and to establish performance benchmarks. The variations in performance were tested for statistical significance. Significant interobserver variability was identified during these assessments. The composite group of board-certified radiologists demonstrated performance superior to that of the radiology residents and nonradiologist physicians. By using a receiver operating characteristic approach and a standardized set of chest radiographs, observer accuracy and variability are easily quantified. This approach provides a basis for comparing the diagnostic performance of physicians. When value is measured as a diminution in uncertainty, board-certified radiologists contribute substantial value to the diagnostic imaging system.
International journal of technology assessment in health care, 1992
International journal of technology assessment in health care, 1992
A demonstration of appearance and union times of three shoulder ossification centers in adolescen... more A demonstration of appearance and union times of three shoulder ossification centers in adolescent and post-adolescent children
Radiology, 2000
Skip to main page content. ...
Journal of applied clinical medical physics / American College of Medical Physics, 2015
The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarke... more The purpose of this study was to evaluate using lesion washout (WO) volume fraction as a biomarker to improve the characterization of suspicious breast lesions. Study lesions consisted of a total of 60 malignant tumors (BI-RADS 6) and 62 suspicious lesions (BI-RADS 4 or 5). The biopsies of these suspicious lesions resulted in a total of 30 malignant tumors and 32 benign lesions, respectively, yielding a 48.4% positive predictive value (PPV) of the biopsies. The mean and standard deviation of the lesion WO volume fraction of these 60 BI-RADS 6 malignant tumors were first computed to establish a 99% sensitivity threshold value for malignant tumors, and then the biomarker was used to characterize the suspicious lesions. Using the biomarker would characterize all the malignant tumors as malignant, 12 out of the 32 benign lesions as benign, potentially resulting in a 24% improvement rate in the PPV of the biopsies (from 48.4% to 60%) and consequently a 22.5% reduction rate in the false-p...
Journal of Forensic Radiology and Imaging, 2015
It is well known that appearance and union times of epiphyseal/apophyseal elements can be used as... more It is well known that appearance and union times of epiphyseal/apophyseal elements can be used as a tool to estimate age in both living and deceased children. Radiographic documentation of ossification centers within the shoulder region however remains underexplored. This study fills that niche by recording the appearance and, or, union times of the proximal humerus, acromial process and coracoid angle/apex. Shoulder radiographs from 264 males and 189 females between the ages of 10 and 21 years were examined. These images were obtained via two sources including the Michigan State University's Clinical Center as well as Query Patricia, an online juvenile radiographic database. Developmental progress of each element was divided into a unique staging system based on the extent to which that center could be visualized. Observations were recorded for each of the three elements and their age/ phase distributions are provided. A number of developmental milestones (phases) were observed to always occur before the age of 16 or 18 years. These results suggest that the shoulder region may be of particular value when evaluating the likely direction of an individual's age in relation to either of these two common threshold values.
International Congress Series
Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Depa... more Numerous factors have an impact on the workflow efficiency in a typical Diagnostic Radiology Department. Enhancing workflow efficiency is especially critical given the current staffing levels of radiologists and radiology technical personnel. Our observation is that one factor that plays an increasingly important role in the adverse effect on technologist productivity is the availability of the supervising radiologist for consultation. Communication patterns were evaluated in our department. Based on our observation, it was determined that a more efficient mechanism of communication was necessary in order to reduce radiologists and technologists time commitments. It was determined that an online, internet-based communication system would be more valuable than a telephony-based system. An integrated communication system was identified and installed in the digital mammography setting. The time required for completion of diagnostic digital mammograms both without and with the communica...
The Journal of the American Osteopathic Association, 1998
Journal of the American College of Radiology, 2009
Objective: Women are underrepresented in radiology. The aim of this study was to measure first-ye... more Objective: Women are underrepresented in radiology. The aim of this study was to measure first-year medical students' level of interest in radiology and their attitudes toward factors that could affect residency specialty choices to further understand how to recruit women into radiology careers.