Abstract
The European Directive 2013/59/Euratom focuses on the radiation protection and patient dosimetry. In particular, the dose absorbed by serial organs such as the spinal cord due to diagnostic exams plays a crucial role in the appraisal of medical exposure. In this work, a comparison between dose measurements performed with GafchromicTM XR-QA2 and TLD 100H is presented. The dosimeters—after a calibration procedure through an X-ray tube—were placed within the thorax region of an anthropomorphic phantom corresponding to the spinal cord area exposed to a thoracic CT procedure. The mean-dose value was measured with GafchromicTM first, and it was then compared to the dose value obtained with TLDs, resulting in a good agreement between the two dosimetric methodologies. Additionally, the results showed that—due to the usage of the automatic exposure control (EC) system—the discrepancy between the two methods is proportional to the current output of the CT system.
Highlights
A comparison between dose measurements performed with GafchromicTM XR-QA2 and TLD 100H is presented
The mean-dose value was measured with GafchromicTM first, and it was compared to the dose value obtained with TLDs, resulting in a good agreement between the two dosimetric methodologies
The evolution and improvement of imaging techniques has contributed to increasing the number of examinations carried out during the hospital routine: clinical imaging is a fundamental tool employed by specialists in the diagnosis of various diseases
Summary
The evolution and improvement of imaging techniques has contributed to increasing the number of examinations carried out during the hospital routine: clinical imaging is a fundamental tool employed by specialists in the diagnosis of various diseases. Wide use of these techniques has led to an increase in the exposure to ionizing radiation, highlighting the dangers and the associated risks. Considerable effort has been put into addressing the assessment the organ doses for many different types of CT scanners (cone- and fan-beam) using different CT scan protocols and dosimetry systems such as, GafchromicTM and TLD crystals [2,3]. The TLD 100H (LiF: Mg, Cu, P) dosimeters are the most-used in clinical dosimetry and in applications where high sensitivity at low doses is needed
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