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A positron emission tomography/computed tomography (PET/CT) acquisition protocol for CT radiation dose optimization
Tung-Hsin Wu1, Tieh-Chi Chu, Yung-Hui Huang
1Institute of Radiological Sciences, National Yang-Ming University, Taipei, Taiwan.
Nuclear Medicine Communications
|March 9, 2005
Summary
Reducing radiation exposure in positron emission tomography/computed tomography (PET/CT) scans is possible. Lowering CT radiation dose does not compromise diagnostic accuracy, improving patient safety.
Area of Science:
- Medical Imaging
- Radiological Physics
Background:
- Combined positron emission tomography/computed tomography (PET/CT) systems enhance diagnostic value and reduce acquisition time.
- However, CT-based attenuation correction increases patient radiation exposure.
Purpose of the Study:
- To compare radiation doses from germanium-based and CT-based transmission scans.
- To evaluate the impact of varying CT acquisition protocols on PET image quality and attenuation correction.
Main Methods:
- Radiation doses were measured using an anthropomorphic phantom and thermoluminescent dosimeters.
- PET image geometric distortion and quantitative uptake values were assessed with different CT protocols.
Main Results:
- Germanium-based scans had negligible radiation doses; CT-based scans had significantly higher doses.
- Lowering CT radiation dose did not significantly impact attenuation correction or PET anatomic delineation.
Conclusions:
- A relationship between image information and radiation dose was established.
- PET/CT protocols can be optimized to reduce radiation risk without sacrificing diagnostic value.