- Email: [email protected]
Digital detector quality assurance testing in Ireland
362
Abstracts / Physica Medica 42 (2017) 353–363
Poster Session p16 Comparison of contrast detail phantoms in mammography Emer Kenny a, Paola Baldelli b, Gillian Egan b, Deirdre King a a
Hermitage Medical Clinic, Ireland b BreastCheck, Ireland E-mail address: [email protected] (E. Kenny) Threshold contrast visibility measurements are used in mammography to assess image quality. The CDMAM contrast detail phantom version 3.4 was used to set the European standards for quality assurance in digital mammography. As such, the phantom has been widely used to assess the threshold contrast of clinical mammography equipment across Ireland. Recently an updated version of the phantom, version 4.0, was released. The CDMAM 4.0 consists of a new layout with more disc diameters and thicknesses than its predecessor. The new version was created with the aim to be more closely adopted to the image quality found in modern mammography systems and to reduce the variability across individual phantoms. This study compares the sensitivity of the two versions of the CDMAM phantom across a range of mammography systems at clinical settings. Contrast detail measurements were taken using the different phantoms on four different makes of digital mammography equipment and images were analysed using CDMAM Analysis v2.1.0 software package. Here we present resuts of a comparison in threshold contrast sensitivity between the two versions of the phantom. https://doi.org/10.1016/j.ejmp.2017.05.038
Poster Session p17 Digital detector quality assurance testing in Ireland Naomi Mc Elroy Tallaght Hospital, Ireland E-mail address: [email protected] As Direct Digital Radiography (DDR) systems are replacing older imaging systems in hospitals, it is essential to ensure that Medical Physicists are performing the most appropriate testing on this newer modality. Specifically, quality control testing on the Digital Detector is central to ensuring adequate image quality to allow clinical diagnosis and treatment. There are a number of different guidelines [1– 4] available on testing for digital systems, however it is unclear what practical approaches are being undertaken in Ireland. A short survey of DR testing practice in Ireland was performed to establish common practice and assist in developing recommendations for progression of this type of testing in conjunction with the Ionising Imaging Special Interest Group (II SIG) of the IAPM. This poster aims to discuss the findings of the survey.
References 1. IPEM Report 32 Part VII (2010) – Measurement of the performance characteristics of Diagnostic X-ray Systems: Digital Imaging Systems. 2. RP162 (2012) Criteria for acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Nuclear Medicine and Radiotherapy.
3. AAPM (2005) Online report 03 Assessment of Display performance for medical imaging systems. 4. IPEM Report 91 (2005) – Recommended standards for the routine performance testing of diagnostic X-ray imaging systems. https://doi.org/10.1016/j.ejmp.2017.05.039
Poster Session p18 Comparison between measured peripheral doses of a Siemens Oncor linear accelerator and AAPM Report No 50 data Eamonn Hayes, Fintan Bradley, Lalan Ramalingam HSE, Ireland E-mail address: [email protected] (E. Hayes) Treatment of pregnant patients with external beam radiotherapy generally speaking is uncommon. In 2016 we made an assessment of likely foetal doses for a pregnant patient. Foetal dose estimation is an important factor in determining the need to construct bespoke shielding devices to limit foetal dose. AAPM REPORT NO. 50 ‘Fetal Dose from Radiotherapy with Photon Beams’ was consulted for guidance. The Report identifies that the principal sources of dose outside a treated volume are, photon leakage through the treatment head, radiation scattered from the collimators/beam modifiers and radiation scattered within the patient from the treatment beams. The Report describes techniques and presents data that can aid in planning and treating pregnant patients using photon beams. We present results of pre-treatment phantom measurements using a Siemens Oncor 6 MV photon beam. Our peripheral dose phantom measurements are shown to be comparable with the data presented in AAPM Report 50, allowing us to use the data in this report with some confidence. https://doi.org/10.1016/j.ejmp.2017.05.040
Poster Session p19 Exploratory regression analysis of the geometric targeting accuracy of the Cyberknife system Bojan Strbac, James Connolly, Catherine Rahill, Mohamed Galal Hermitage Medical Clinic, Ireland E-mail address: [email protected] (B. Strbac) Quality Assurance is an important part of a safe radiotherapy service. The End to End (E2E) test assesses the overall spatial targeting accuracy of the integrated CyberKnife system for multiple beams delivered isocentrically. The targeting accuracy is quantified based on the dose distribution recorded on film. The complexity of the entire process suggests that data-driven approaches can provide robust solutions for the detection and prediction of errors. Regression analysis is a statistical technique for determining the relationship between a single dependent (criterion) variable (in this analysis: total targeting error) and one or more independent (predictor) variables, which are specific error components from the Anterior-Posterior(AP), Left–Right(LR) or Superior–Inferior(SI) directions. Dominance analysis (DA) was used as a method to find whether one independent variable contributes more variance to the regression effect than another independent variable on average
Abstracts / Physica Medica 42 (2017) 353–363
Poster Session p16 Comparison of contrast detail phantoms in mammography Emer Kenny a, Paola Baldelli b, Gillian Egan b, Deirdre King a a
Hermitage Medical Clinic, Ireland b BreastCheck, Ireland E-mail address: [email protected] (E. Kenny) Threshold contrast visibility measurements are used in mammography to assess image quality. The CDMAM contrast detail phantom version 3.4 was used to set the European standards for quality assurance in digital mammography. As such, the phantom has been widely used to assess the threshold contrast of clinical mammography equipment across Ireland. Recently an updated version of the phantom, version 4.0, was released. The CDMAM 4.0 consists of a new layout with more disc diameters and thicknesses than its predecessor. The new version was created with the aim to be more closely adopted to the image quality found in modern mammography systems and to reduce the variability across individual phantoms. This study compares the sensitivity of the two versions of the CDMAM phantom across a range of mammography systems at clinical settings. Contrast detail measurements were taken using the different phantoms on four different makes of digital mammography equipment and images were analysed using CDMAM Analysis v2.1.0 software package. Here we present resuts of a comparison in threshold contrast sensitivity between the two versions of the phantom. https://doi.org/10.1016/j.ejmp.2017.05.038
Poster Session p17 Digital detector quality assurance testing in Ireland Naomi Mc Elroy Tallaght Hospital, Ireland E-mail address: [email protected] As Direct Digital Radiography (DDR) systems are replacing older imaging systems in hospitals, it is essential to ensure that Medical Physicists are performing the most appropriate testing on this newer modality. Specifically, quality control testing on the Digital Detector is central to ensuring adequate image quality to allow clinical diagnosis and treatment. There are a number of different guidelines [1– 4] available on testing for digital systems, however it is unclear what practical approaches are being undertaken in Ireland. A short survey of DR testing practice in Ireland was performed to establish common practice and assist in developing recommendations for progression of this type of testing in conjunction with the Ionising Imaging Special Interest Group (II SIG) of the IAPM. This poster aims to discuss the findings of the survey.
References 1. IPEM Report 32 Part VII (2010) – Measurement of the performance characteristics of Diagnostic X-ray Systems: Digital Imaging Systems. 2. RP162 (2012) Criteria for acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Nuclear Medicine and Radiotherapy.
3. AAPM (2005) Online report 03 Assessment of Display performance for medical imaging systems. 4. IPEM Report 91 (2005) – Recommended standards for the routine performance testing of diagnostic X-ray imaging systems. https://doi.org/10.1016/j.ejmp.2017.05.039
Poster Session p18 Comparison between measured peripheral doses of a Siemens Oncor linear accelerator and AAPM Report No 50 data Eamonn Hayes, Fintan Bradley, Lalan Ramalingam HSE, Ireland E-mail address: [email protected] (E. Hayes) Treatment of pregnant patients with external beam radiotherapy generally speaking is uncommon. In 2016 we made an assessment of likely foetal doses for a pregnant patient. Foetal dose estimation is an important factor in determining the need to construct bespoke shielding devices to limit foetal dose. AAPM REPORT NO. 50 ‘Fetal Dose from Radiotherapy with Photon Beams’ was consulted for guidance. The Report identifies that the principal sources of dose outside a treated volume are, photon leakage through the treatment head, radiation scattered from the collimators/beam modifiers and radiation scattered within the patient from the treatment beams. The Report describes techniques and presents data that can aid in planning and treating pregnant patients using photon beams. We present results of pre-treatment phantom measurements using a Siemens Oncor 6 MV photon beam. Our peripheral dose phantom measurements are shown to be comparable with the data presented in AAPM Report 50, allowing us to use the data in this report with some confidence. https://doi.org/10.1016/j.ejmp.2017.05.040
Poster Session p19 Exploratory regression analysis of the geometric targeting accuracy of the Cyberknife system Bojan Strbac, James Connolly, Catherine Rahill, Mohamed Galal Hermitage Medical Clinic, Ireland E-mail address: [email protected] (B. Strbac) Quality Assurance is an important part of a safe radiotherapy service. The End to End (E2E) test assesses the overall spatial targeting accuracy of the integrated CyberKnife system for multiple beams delivered isocentrically. The targeting accuracy is quantified based on the dose distribution recorded on film. The complexity of the entire process suggests that data-driven approaches can provide robust solutions for the detection and prediction of errors. Regression analysis is a statistical technique for determining the relationship between a single dependent (criterion) variable (in this analysis: total targeting error) and one or more independent (predictor) variables, which are specific error components from the Anterior-Posterior(AP), Left–Right(LR) or Superior–Inferior(SI) directions. Dominance analysis (DA) was used as a method to find whether one independent variable contributes more variance to the regression effect than another independent variable on average