Title: Imaging by SPECT/CT: Patient effective dose due to CT irradiation
Abstract:1941 Objectives SPECT in combination with CT enables a direct correlation of anatomic information and functional definition of scintigraphic findings. However patient is exposed to both internal radia...1941 Objectives SPECT in combination with CT enables a direct correlation of anatomic information and functional definition of scintigraphic findings. However patient is exposed to both internal radiation due to radiopharmaceuticals and transmission radiation due to CT. While internal radiation dose can be simulated with Monte Carlo method for most commonly used radiopharmaceuticals, organ specific radiation absorbed doses by CT irradiation should be measured to provide patient information and to optimize the clinical protocols. The effective dose due to CT can be summed together with effective dose due to emission to give the total patient effective dose to compare with radiation dose with other imaging technique. Methods With the use of thermoluminescence dosimeters (TLD-100H) and humanoid phantom, the organ absorbed doses were measured by irradiating the phantom with a SPECT/CT machine. As an example for discussion, a protocol for a clinical protocol for inflammation study was used, in that patient thorax, abdomen and part of pelvis were irradiated. Organ weighting factors from ICRP-103 were used to calculate the effective dose. Results Patient effective dose for inflammation protocol was measured as 4.62 mSv for female and 4.58 mSv for male adult. The slight difference in effective dose between both sex is the irradiated ovary in female and partially irradiation testis in male. As most radiation sensitive organs were irradiated in this inflammation study, the effective doses represent the maximum due to CT irradiation. Conclusions Effective dose due to CT irradiation from a SPECT/CT machine should be measured to provide patient information and to ensure optimized clinical protocol in imaging and dosimetryRead More
Publication Year: 2011
Publication Date: 2011-05-01
Language: en
Type: article
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