Purpose The aim of our study was, first, to measure association between radiologists and faciliti... more Purpose The aim of our study was, first, to measure association between radiologists and facilities characteristics and DCIS detection. Second, to assess whether those characteristics affect differently the likelihood of detection of DCIS versus invasive breast cancer. When applicable, we examined whether the identified characteristics were similarly associated with low-grade and high-grade DCIS detection. Methods This retrospective cohort study included 1,750,002 digital screening mammograms (2145 screen-detected DCIS) performed in the Quebec breast cancer screening program between 2007 and 2015 inclusively. The associations between radiologists’ and facilities’ characteristics and (1) the DCIS detection rate, (2) the invasive detection rate, and (3) the odds of DCIS on invasive detection were assess. For statistically significant associations in the latter analysis, analyses stratified by DCIS grade were performed. Multivariable logistic regression with generalized estimating equations estimates to account for correlation among mammograms was used. Results Compared to radiologists with recall rate between 5.0 and 9.9%, radiologists with recall rate between 15.0–19.9% and ≥ 20% reached a higher DCIS detection rate, with adjusted detection ratios of, respectively, 1.33 (95% confidence interval = 1.15–1.53) and 1.43 (95% confidence interval = 1.13–1.81). Increase in radiologist’ recall rate was statistically significantly associated with an increase in detection of low/intermediate-grade DCIS ( P < 0.001), while not in high-grade DCIS ( P = 0.15). Conclusions A major determinant of DCIS detection is the radiologists’ recall rate. Abnormalities referred by radiologists with higher recall rates should be identified in order to understand how to decrease recall rate while keeping an optimal DCIS and invasive detection rate.
Canadian Association of Radiologists Journal, 2018
Purpose The study sought to examine the association between clinical image quality of mammograms ... more Purpose The study sought to examine the association between clinical image quality of mammograms and screening sensitivity. Methods Four radiologists evaluated the clinical image quality of 374 invasive screen-detected cancers and 356 invasive interval breast cancers for which quality evaluation of screening mammograms could be assessed from cancers diagnosed among participants in the Quebec Breast Cancer Screening Program in 2007. Quality evaluation was based on the Canadian Association of Radiologists accreditation criteria, which are similar to those of the American College of Radiology. The association between clinical quality and screening sensitivity was assessed by logistic regression. Adjusted sensitivity and adjusted sensitivity ratios were obtained through marginal standardization. No institutional review board approval was required. Results A proportion of 28% (206 of 730) of screening mammograms had lower overall quality for the majority of assessments. Positioning was t...
Canadian Association of Radiologists Journal, 2019
Purpose To examine the relation between breast cancer location and screening mammogram sensitivit... more Purpose To examine the relation between breast cancer location and screening mammogram sensitivity, and assess whether this association is modified by body mass index (BMI) or breast density. Methods This study is based on all interval cancers (n = 481) and a random sample of screen-detected cancers (n = 481) diagnosed in Quebec Breast Cancer Screening Program participants in 2007. Film-screening mammograms, diagnostic mammograms, and ultrasound reports (when available) were requested for these cases. The breast cancer was then localised in mediolateral oblique (MLO) and craniocaudal (CC) projections of the breast by 1 experienced radiologist. The association between cancer location and screening sensitivity was assessed by logistic regression. Adjusted sensitivity and sensitivity ratios were obtained by marginal standardisation. Results A total of 369 screen-detected and 268 interval cancers could be localised in MLO and/or CC projections. The 2-year sensitivity reached 68%. Overal...
Proceedings of the International Conference on Recent Cognizance in Wireless Communication & Image Processing, 2016
Contact resistance and series resistance are the most crucial problem to collect carrier from the... more Contact resistance and series resistance are the most crucial problem to collect carrier from the both electrodes. In general, contacts are made by screen printing process which is industrially established. After the screen printing process some factors arises like change of with and thickness of finger and pores are created on the top side due to solvent. For the unavoidable pores series resistance is decreased. In this paper, the mathematical modeling has done considering resistance and distribution of pores.
Purpose The aim of our study was, first, to measure association between radiologists and faciliti... more Purpose The aim of our study was, first, to measure association between radiologists and facilities characteristics and DCIS detection. Second, to assess whether those characteristics affect differently the likelihood of detection of DCIS versus invasive breast cancer. When applicable, we examined whether the identified characteristics were similarly associated with low-grade and high-grade DCIS detection. Methods This retrospective cohort study included 1,750,002 digital screening mammograms (2145 screen-detected DCIS) performed in the Quebec breast cancer screening program between 2007 and 2015 inclusively. The associations between radiologists’ and facilities’ characteristics and (1) the DCIS detection rate, (2) the invasive detection rate, and (3) the odds of DCIS on invasive detection were assess. For statistically significant associations in the latter analysis, analyses stratified by DCIS grade were performed. Multivariable logistic regression with generalized estimating equations estimates to account for correlation among mammograms was used. Results Compared to radiologists with recall rate between 5.0 and 9.9%, radiologists with recall rate between 15.0–19.9% and ≥ 20% reached a higher DCIS detection rate, with adjusted detection ratios of, respectively, 1.33 (95% confidence interval = 1.15–1.53) and 1.43 (95% confidence interval = 1.13–1.81). Increase in radiologist’ recall rate was statistically significantly associated with an increase in detection of low/intermediate-grade DCIS ( P < 0.001), while not in high-grade DCIS ( P = 0.15). Conclusions A major determinant of DCIS detection is the radiologists’ recall rate. Abnormalities referred by radiologists with higher recall rates should be identified in order to understand how to decrease recall rate while keeping an optimal DCIS and invasive detection rate.
Canadian Association of Radiologists Journal, 2018
Purpose The study sought to examine the association between clinical image quality of mammograms ... more Purpose The study sought to examine the association between clinical image quality of mammograms and screening sensitivity. Methods Four radiologists evaluated the clinical image quality of 374 invasive screen-detected cancers and 356 invasive interval breast cancers for which quality evaluation of screening mammograms could be assessed from cancers diagnosed among participants in the Quebec Breast Cancer Screening Program in 2007. Quality evaluation was based on the Canadian Association of Radiologists accreditation criteria, which are similar to those of the American College of Radiology. The association between clinical quality and screening sensitivity was assessed by logistic regression. Adjusted sensitivity and adjusted sensitivity ratios were obtained through marginal standardization. No institutional review board approval was required. Results A proportion of 28% (206 of 730) of screening mammograms had lower overall quality for the majority of assessments. Positioning was t...
Canadian Association of Radiologists Journal, 2019
Purpose To examine the relation between breast cancer location and screening mammogram sensitivit... more Purpose To examine the relation between breast cancer location and screening mammogram sensitivity, and assess whether this association is modified by body mass index (BMI) or breast density. Methods This study is based on all interval cancers (n = 481) and a random sample of screen-detected cancers (n = 481) diagnosed in Quebec Breast Cancer Screening Program participants in 2007. Film-screening mammograms, diagnostic mammograms, and ultrasound reports (when available) were requested for these cases. The breast cancer was then localised in mediolateral oblique (MLO) and craniocaudal (CC) projections of the breast by 1 experienced radiologist. The association between cancer location and screening sensitivity was assessed by logistic regression. Adjusted sensitivity and sensitivity ratios were obtained by marginal standardisation. Results A total of 369 screen-detected and 268 interval cancers could be localised in MLO and/or CC projections. The 2-year sensitivity reached 68%. Overal...
Proceedings of the International Conference on Recent Cognizance in Wireless Communication & Image Processing, 2016
Contact resistance and series resistance are the most crucial problem to collect carrier from the... more Contact resistance and series resistance are the most crucial problem to collect carrier from the both electrodes. In general, contacts are made by screen printing process which is industrially established. After the screen printing process some factors arises like change of with and thickness of finger and pores are created on the top side due to solvent. For the unavoidable pores series resistance is decreased. In this paper, the mathematical modeling has done considering resistance and distribution of pores.
Uploads
Papers by R Raushan