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Showing 2 results for Pathy
S.f. Mohd Ridzwan, L. Fritschi, Ph.d., N. Bhoo-Pathy,
Volume 21, Issue 3 (7-2023)
Abstract
Background: The Background: To assess the radiation protection and radiation monitoring practices among medical radiation workers (MRWs) in Malaysian hospitals, and to identify demographic and occupational factors influencing the consistent use of radioprotective garments and dosimeters. Materials and Methods: A link to an online survey was distributed to MRWs with the help of research coordinators at participating hospitals. A total of 387 respondents answered the online survey between April and June 2019. They reported the consistency with which they used radioprotective garments, dosimeters and other protective measures, together with the reasons for inconsistency. We then compared consistent and inconsistent groups by demographic and occupational data. Results: The respondents exhibited excellent adherence to radiation protection but showed poor adherence to radiation monitoring. The main reasons for non-use of radioprotective garments were inadequate items and the need to prioritize others. Forgetfulness and fear of losing dosimeters were the common reasons for the non-consistent use of monitoring devices. Radiologists were the most consistent group using radioprotective garments compared to other job positions (p<.050). Middle-aged respondents were more consistent in using radioprotective aprons than younger respondents (p<.005). Work schedule, institution and gender also influenced the consistency of using radioprotective garments and dosimeters. Conclusion: There is an urgent need to improve the personal dosimeter adherence rate in this country and any shortage of radioprotective garments should be tackled immediately. Ultimately, it is crucial to understand the workers’ tasks and their safety measures to avoid underestimating occupational radiation exposure and risk.
Ph.d., S. Sharma, D. Sharma, V. Subramani, N. Gopishankar, S. Bhaskar, S. Pathy, P.kumar Kumar, S. Thulkar, S. Chander,
Volume 21, Issue 4 (10-2023)
Abstract
Background: Aim is to find correlation between 2D-gamma passing rate and 3D-DVH-based pre-treatment patient-specific quality assurance. Materials and Methods: 21 head and neck and 21 pelvis patients, treated with volumetric modulated arc therapy (VMAT) were selected for this study. All patients were planned with Elekta VersaHD linear accelerator using Monaco (5.11) treatment planning system. 2D-planar dose measurements were performed with IBA-I'matriXX evolution detector-array using My-QA-Patients software. For 2D-Gamma index evaluation, 3%/3mm and 2%/2mm criteria were used. 3D-dose measurements were performed using the IBA-COMPASS system. For 3D measurement, Monaco and COMPASS doses were compared in terms of percentage dose differences to PTV and organs at risk. For PTV D95, D2, and D50 (dose received by 95%, 2%, and 50% volume), similarly for OARs D2 and D50 were noted. 3D Gamma index was also noted. Correlation coefficient and its corresponding two-tailed p-value (≤0.05, for statistically significant) were calculated for 2D-gamma passing rate and 3D Gamma index & percentage dose differences of 3D-DVH based metrics (Monaco calculated versus COMPASS measured). Strength of correlation will be considered weak or strong based on the r -value. Results: 2D-Gamma index passing rate was 98.6±1.8%, 92.1±7.1% and 98.5±1.3%, 93.5±4.4% for head-neck and pelvis patients (3%/3mm, 2%/2mm criteria) respectively. Percentage dose-differences for PTV D95, D2, D50 for head-neck and pelvis were: 4.22±2.09%, 4.25±2.23%, 3.93±1.59 & 0.60±1.96%, 1.53±1.64%, 1.59±1.20% respectively. Spine and brainstem D2 were -0.84±6.10%, 0.77±2.70%, bladder and rectum D50 were 3.75±3.31%, -2.19±3.60%. Conclusion: No strong correlation was observed between the 2D Gamma passing rate and 3D measurements.
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