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Jaydev K. Dave - One of the best experts on this subject based on the ideXlab platform.

  • SU-G-IeP3-05: Effects of Image Receptor Technology and Dose Reduction Software On Radiation Dose Estimates for Fluoroscopically-Guided Interventional (FGI) Procedures
    Medical Physics, 2016
    Co-Authors: Z Merritt, Jaydev K. Dave, David J. Eschelman, Carin F. Gonsalves
    Abstract:

    Purpose: To investigate the effects of Image Receptor technology and dose reduction software on radiation dose estimates for most frequently performed fluoroscopically-guided interventional (FGI) procedures at a tertiary health care center. Methods: IRB approval was obtained for retrospective analysis of FGI procedures performed in the interventional radiology suites between January-2011 and December-2015. This included procedures performed using Image-intensifier (II) based systems which were subsequently replaced, flat-panel-detector (FPD) based systems which were later upgraded with ClarityIQ dose reduction software (Philips Healthcare) and relatively new FPD system already equipped with ClarityIQ. Post procedure, technologists entered system-reported cumulative air kerma (CAK) and kerma-area product (KAP; only KAP for II based systems) in RIS; these values were analyzed. Data pre-processing included correcting typographical errors and cross-verifying CAK and KAP. The most frequent high and low dose FGI procedures were identified and corresponding CAK and KAP values were compared. Results: Out of 27,251 procedures within this time period, most frequent high and low dose procedures were chemo/immuno-embolization (n=1967) and abscess drainage (n=1821). Mean KAP for embolization and abscess drainage procedures were 260,657, 310,304 and 94,908 mGycm2, and 14,497, 15,040 and 6307 mGycm2 using II-, FPD- and FPD with ClarityIQ- based systems, respectively. Statistically significant differences were observed in KAP values for embolization procedures with respect to different systems but for abscess drainage procedures significant differences were only noted between systems with FPD and FPD with ClarityIQ (p

  • SU‐E‐I‐101: Initial Implementation and Evaluation of AAPM TG‐150 Draft Image Receptor Non‐Uniformity Testing Recommendations
    Medical Physics, 2012
    Co-Authors: Jaydev K. Dave, E Gingold, J Yorkston, I Bercha, L Goldman, A. Walz‐flannigan, Charles E. Willis
    Abstract:

    Purpose: To implement in software the procedures described in AAPM Task Group 150's draft recommendations for Image Receptor performance testing, and to evaluate the effectiveness and practicality of these procedures. Methods:Images of flat fields were acquired using digital x‐ray Image Receptors at 6 cooperating institutions. Four flat field Images obtained with each detector spanned a range of input detector air kerma. Software based on AAPM TG150's draft report processed the test Images and generated results. Image Receptor response and several measures of non‐uniformity were evaluated. Images were divided into 10 mm square regions, after eliminating 10 mm borders. For each region, signal (mean), noise (standard deviation) and SNR were calculated. Characteristic signal, noise and SNR were calculated based on average values from all regions. Local non‐uniformity for signal (SLN), noise (NLN) and SNR (SNRLN) were expressed as the maximum ratio of the absolute difference between each region's value and its 4 nearest neighbors, to the respective characteristic value. Global non‐uniformity (SGN, NGN, SNRGN) were expressed similarly but differences between maximum and minimum values obtained from the regions were used (without comparison to local neighbors). Results: TG150 tests discriminated between good and poorly performing detectors. Improper detectorcalibration was detectable, with noise non‐uniformity proving to be a more sensitive measure than signal or SNR non‐uniformity. Detector rotation relative to calibration conditions produced a greater change in signal non‐uniformity than the other measures.Image Receptor structured noise was characterized by an increase in noise non‐uniformity with incident air kerma. Conclusions: AAPM TG150's proposed approach to Image Receptor testing was implemented and evaluated. The approach appears to be an effective and practical one for routine quality assurancetesting of digital radiographicImage Receptors.

Ali Mert - One of the best experts on this subject based on the ideXlab platform.

  • Effect of tube potential and Image Receptor on the detection of natural proximal caries in primary teeth
    Clinical Oral Investigations, 2011
    Co-Authors: Elif Sogur, B. Güniz Baksı, Kaan Orhan, S. Candan Paksoy, Salih Dogan, Yılmaz S. Erdal, Ali Mert
    Abstract:

    The aim of this study was to assess the detection of proximal caries in primary teeth at three different tube potentials using Ektaspeed films, storage phosphor plates (SPPs), and a charge-coupled device (CCD). Fifty-three extracted human primary molars with natural proximal caries were radiographed with three different imaging modalities—Digora Optime SPP system, RVGui CCD system, and Ektaspeed films—at 50-, 65-, and 70-kV tube potentials. Three observers scored the resultant Images for the presence or absence of caries. The definitive diagnosis was determined by stereomicroscopic assessment. The diagnostic accuracy for each imaging modality was expressed as the area under the receiver operating characteristic curves ( A _z). Differences among the A _z values were assessed using two-way ANOVA and t tests. Kappa was used to measure inter- and intra-observer agreement. Higher accuracy was found for SPPs compared to film and CCD Images at all tube potentials. Accuracy was significantly different only at 50-kV tube setting in favor of SPPs ( p  

  • Effect of tube potential and Image Receptor on the detection of natural proximal caries in primary teeth.
    Clinical oral investigations, 2010
    Co-Authors: Elif Sogur, B. Güniz Baksı, Kaan Orhan, S. Candan Paksoy, Salih Dogan, Yılmaz S. Erdal, Ali Mert
    Abstract:

    The aim of this study was to assess the detection of proximal caries in primary teeth at three different tube potentials using Ektaspeed films, storage phosphor plates (SPPs), and a charge-coupled device (CCD). Fifty-three extracted human primary molars with natural proximal caries were radiographed with three different imaging modalities—Digora Optime SPP system, RVGui CCD system, and Ektaspeed films—at 50-, 65-, and 70-kV tube potentials. Three observers scored the resultant Images for the presence or absence of caries. The definitive diagnosis was determined by stereomicroscopic assessment. The diagnostic accuracy for each imaging modality was expressed as the area under the receiver operating characteristic curves (Az). Differences among the Az values were assessed using two-way ANOVA and t tests. Kappa was used to measure inter- and intra-observer agreement. Higher accuracy was found for SPPs compared to film and CCD Images at all tube potentials. Accuracy was significantly different only at 50-kV tube setting in favor of SPPs (p < 0.05). Inter- and intra-observer agreement was high for all systems. A SPP system can be recommended for dental peadodontic clinics particularly with 50-kV tube potential for the diagnosis of proximal caries since further advantages include the elimination of chemical processing, Image enhancement, and a better low-contrast detectability performance.

Charles E. Willis - One of the best experts on this subject based on the ideXlab platform.

  • SU‐E‐I‐101: Initial Implementation and Evaluation of AAPM TG‐150 Draft Image Receptor Non‐Uniformity Testing Recommendations
    Medical Physics, 2012
    Co-Authors: Jaydev K. Dave, E Gingold, J Yorkston, I Bercha, L Goldman, A. Walz‐flannigan, Charles E. Willis
    Abstract:

    Purpose: To implement in software the procedures described in AAPM Task Group 150's draft recommendations for Image Receptor performance testing, and to evaluate the effectiveness and practicality of these procedures. Methods:Images of flat fields were acquired using digital x‐ray Image Receptors at 6 cooperating institutions. Four flat field Images obtained with each detector spanned a range of input detector air kerma. Software based on AAPM TG150's draft report processed the test Images and generated results. Image Receptor response and several measures of non‐uniformity were evaluated. Images were divided into 10 mm square regions, after eliminating 10 mm borders. For each region, signal (mean), noise (standard deviation) and SNR were calculated. Characteristic signal, noise and SNR were calculated based on average values from all regions. Local non‐uniformity for signal (SLN), noise (NLN) and SNR (SNRLN) were expressed as the maximum ratio of the absolute difference between each region's value and its 4 nearest neighbors, to the respective characteristic value. Global non‐uniformity (SGN, NGN, SNRGN) were expressed similarly but differences between maximum and minimum values obtained from the regions were used (without comparison to local neighbors). Results: TG150 tests discriminated between good and poorly performing detectors. Improper detectorcalibration was detectable, with noise non‐uniformity proving to be a more sensitive measure than signal or SNR non‐uniformity. Detector rotation relative to calibration conditions produced a greater change in signal non‐uniformity than the other measures.Image Receptor structured noise was characterized by an increase in noise non‐uniformity with incident air kerma. Conclusions: AAPM TG150's proposed approach to Image Receptor testing was implemented and evaluated. The approach appears to be an effective and practical one for routine quality assurancetesting of digital radiographicImage Receptors.

C Willis - One of the best experts on this subject based on the ideXlab platform.

  • SU-E-I-101: Initial Implementation and Evaluation of AAPM TG-150 Draft Image Receptor Non-Uniformity Testing Recommendations.
    Medical physics, 2012
    Co-Authors: J Dave, E Gingold, J Yorkston, I Bercha, L Goldman, A Walz-flannigan, C Willis
    Abstract:

    To implement in software the procedures described in AAPM Task Group 150's draft recommendations for Image Receptor performance testing, and to evaluate the effectiveness and practicality of these procedures. Images of flat fields were acquired using digital x-ray Image Receptors at 6 cooperating institutions. Four flat field Images obtained with each detector spanned a range of input detector air kerma. Software based on AAPM TG150's draft report processed the test Images and generated results. Image Receptor response and several measures of non-uniformity were evaluated. Images were divided into 10 mm square regions, after eliminating 10 mm borders. For each region, signal (mean), noise (standard deviation) and SNR were calculated. Characteristic signal, noise and SNR were calculated based on average values from all regions. Local non-uniformity for signal (SLN), noise (NLN) and SNR (SNRLN) were expressed as the maximum ratio of the absolute difference between each region's value and its 4 nearest neighbors, to the respective characteristic value. Global non-uniformity (SGN, NGN, SNRGN) were expressed similarly but differences between maximum and minimum values obtained from the regions were used (without comparison to local neighbors). TG150 tests discriminated between good and poorly performing detectors. Improper detector calibration was detectable, with noise non-uniformity proving to be a more sensitive measure than signal or SNR non-uniformity. Detector rotation relative to calibration conditions produced a greater change in signal non-uniformity than the other measures. Image Receptor structured noise was characterized by an increase in noise non-uniformity with incident air kerma. AAPM TG150's proposed approach to Image Receptor testing was implemented and evaluated. The approach appears to be an effective and practical one for routine quality assurance testing of digital radiographic Image Receptors. © 2012 American Association of Physicists in Medicine.

D O'leary - One of the best experts on this subject based on the ideXlab platform.

  • The Increased Source to Image-Receptor Distance Technique: What Is Preventing Implementation in Clinical Practice?
    Journal of medical imaging and radiation sciences, 2014
    Co-Authors: Maria Joyce, D O'leary
    Abstract:

    Abstract Evidence in the literature shows that increasing the source to Image-Receptor distance (SID) can optimize specific radiographic projections; yet, despite this evidence base, the technique is not commonly practiced within all radiology departments. The present work aimed to bridge the gap between evidence and practice by interviewing allied health professionals to investigate the feasibility of implementing the technique in clinical practice. Opinions were sought from multiple sources to triangulate the data including radiographers, medical physicists, professional body council members, and university lecturers. Data were collected via telephone and departmental surveys, self-administered questionnaires, focus groups, and individual interviews. Analysis via keywords and themes was undertaken. Tradition, the capacity to change practice, and radiographic equipment were perceived as the main obstacles against clinical implementation. Seventy-five percent of radiographers working with modern equipment did not perceive any disadvantage to the radiographer in extending the SID by 30–50 cm compared with 59% of radiographers working with older equipment. However, when radiographer perceptions of implementing the technique were analysed, 100% of radiographers responded positively to increased SID implementation, especially “if given more information.” The key to effective clinical implementation is to adopt a multidisciplinary approach and to actively disseminate information among hospital management and radiographers. There are no insurmountable issues preventing the implementation of the increased SID technique in clinical practice, and encouraging radiographers to explore optimization strategies has the potential to advance evidence-based practice within the profession.

  • Reducing dose for digital cranial radiography : The increased source to the Image-Receptor distance approach
    Journal of medical imaging and radiation sciences, 2013
    Co-Authors: Maria Joyce, Mark F. Mcentee, Patrick C. Brennan, D O'leary
    Abstract:

    This investigation proposes that an increased source to the Image-Receptor distance (SID) technique can be used to optimize occipital frontal and lateral cranial radiographs acquired with direct digital radiography. Although cranial radiography is not performed on a routine basis, it should nonetheless be optimized to keep the dose to the patient as low as reasonably achievable, particularly because it can form part of the facial bone and sinus series. Dose measurements were acquired at various SIDs, and Image quality was assessed using visual grading analysis. Statistically significant reductions in the effective dose between 19.2% and 23.9% were obtained when the SID was increased from the standard 100 to 150 cm (P ≤ .05), and visual grading analysis scores indicate that Image quality remained diagnostically acceptable for both projections. This investigation concludes that increasing the SID effectively optimizes occipital frontal and lateral skull radiographs. Radiology departments must be advised of the benefits of this technique with the goal of introducing an updated reference SID of 150 cm into clinical practice.

  • Source to Image Receptor distance
    The British Journal of Radiology, 2006
    Co-Authors: Patrick C. Brennan, D O'leary
    Abstract:

    Peer reviewe