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

doi:10.1117/12.2563998

22 May 2020 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, 15th International Workshop on Breast Imaging (IWBI2020); 115132E (2020) https://doi.org/10.1117/12.2563998
Event: Fifteenth International Workshop on Breast Imaging, 2020, Leuven, Belgium

Abstract

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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P. L. Squair, I. S. Morais, P. C. Santana, P. M. C. Oliveira, L. F. Souza, and N. S. Nogueira "HVL mammography and tomosynthesis measurements with TLD system and different solid-state dosimeters", Proc. SPIE 11513, 15th International Workshop on Breast Imaging (IWBI2020), 115132E (22 May 2020); https://doi.org/10.1117/12.2563998

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KEYWORDS

Sensors

Mammography

Solid state electronics

X-rays

Electronics

Ionization

Ions

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