Feasibility of determining mammography dose using LuSy dosimeter. (November 2022)

• Record Type: Journal Article
• Authors: Wahabi, Janatul Madinah; Abdul Aziz, Quratu' Aini; Ng, Kwan Hoong; Rahmat, Kartini; Ung, Ngie Min; Mahdiraji, Ghafour A.; Ding Wong, Jeannie Hsiu
• Is Part Of: Radiation physics and chemistry. Volume 200(2022)
• Publication Date: 2022-11
• Subjects: Scintillation dosimeter -- Mean glandular dose -- Fibre optic dosimeter -- Mammography; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2022.110389
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Mammography is a radiological examination that utilises low-energy X-ray to detect breast cancer. The techniques include full-field digital mammography (FFDM) and digital breast tomosynthesis (DBT), which produce 2D and 3D breast images, respectively. Mean glandular dose (MGD) is used to describe the dose delivered by these techniques because it estimates the photon absorption by glandular tissues in the breast. This study aims to calibrate, characterise and determine the feasibility of measuring MGD using an in-house developed, real-time fibre-optic dosimeter called the LuSy dosimeter. LuSy was calibrated against a solid-state mammography dosimeter for three target-filter combinations of W/Rh, W/Ag and W/Al. Subsequently, characterisation towards mammography radiation was carried out. Finally, MGD was measured using LuSy and subsequently compared with the readings of a solid-state detector and those estimated by the mammography machine. The measured calibration coefficient was 342.10, 380.35 and 447.68 counts/mGy for W/Rh, W/Ag and W/Al target-filter combinations, respectively. For MGD, both LuSy and the mammography dosimeter measured a higher dose compared with the machine console. The mean deviation between LuSy and machine console was 14.72%. Meanwhile, the mean deviation between the mammography dosimeter and the machine console was 19.5%. In conclusion, the LuSy may be calibrated to measure low-energy X-ray, and its MGD reading is comparable with a solid-state dosimeter. Highlights: LuSy is a real-time radioluminescent dosimetry system with plastic scintillator. Calibration of LuSy dosimeter to a solid-state mammography dosimeter. Characterising LuSy dosimeter to mammography energy and radiation geometries. Measurement of mean glandular dose for different mammography techniques.