Dr. Priscila C. Santana Profile

Dr. Priscila C. Santana

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Proceedings Article | 22 May 2020 Paper

HVL mammography and tomosynthesis measurements with TLD system and different solid-state dosimeters

P. L. Squair, I. S. Morais, P. C. Santana, P. M. C. Oliveira, L. F. Souza, N. S. Nogueira

Proceedings Volume 11513, 115132E (2020) https://doi.org/10.1117/12.2563998

KEYWORDS: Sensors, Mammography, X-rays, Solid state electronics, Electronics, Ions, Ionization, Diagnostics, Computed tomography, Calibration

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Mammography and tomosynthesis diagnostic techniques contribute to the patient dose and the estimation of the Mean Glandular Dose (MGD) for x-ray based imaging modalities forms an essential part of quality control (QC) and for system optimization. This study compares three solid‐state dosimeters (SStDs) and one thermoluminescence dosimeter (TLD) with a half value layer (HVL) measurements by ion chamber. These electronics SStDs instruments are very efficient in clinical practice. However, a specialized technician is required for its operation and the clinics do not have this instrumentation. Thus, the application of a TLD system becomes an important means for determining the MGD through the evaluation of K_a,iand HVL. For measurements used a Siemens Mammomat 3000 Nova mammography to evaluate the dosimetry systems. The three electronics SStDs detectors (Accu-Gold Radcal, Unfors RaySafe Xi and Piranha), TLD system and TRS457 table were compared with ion chamber results for HVL. The results showed that SStDs and TLD dosimeters have a flat HVL response under clinical conditions (less than 5%). However, the SStDs detectors tended to overestimate the measurements. However, all results were equivalent (p<0,05) for all HVL evalueted.

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