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FACTORS INFLUENCING SIZE-SPECIFIC DOSE ESTIMATES OF SELECTED COMPUTED TOMOGRAPHY PROTOCOLS AT TWO CLINICAL PRACTICES
Ida-Keshia Sebelego1, Sussan Acho2, Belinda van der Merwe1
1Department of Clinical Sciences, Faculty of Health and Environmental Sciences, Central University of Technology, Bloemfontein, 9301, South Africa.
Radiation Protection Dosimetry
|March 17, 2023
Summary
Computed tomography (CT) dose, specifically size-specific dose estimate (SSDE), is influenced by patient body mass index and imaging parameters. Optimizing CT protocols is crucial for maintaining diagnostic image quality while minimizing radiation exposure.
Area of Science:
- Radiology
- Medical Imaging
- Radiation Dosimetry
Background:
- Computed tomography (CT) examinations require careful dose management to balance diagnostic accuracy and patient safety.
- Size-specific dose estimate (SSDE) is a critical metric for assessing patient radiation dose in CT.
- Variations in CT protocols and equipment across different clinical practices can impact dose and image quality.
Purpose of the Study:
- To identify factors affecting SSDE in chest-abdomen-pelvis and abdomen-pelvis CT protocols.
- To evaluate the image quality of these CT protocols in two distinct clinical settings.
- To assess the relationship between SSDE, image quality, and diagnostic performance.
Main Methods:
- Documented imaging parameters, CT dose metrics (CTDIvol), and patient size-related data for SSDE calculation.
- Utilized an image subtraction algorithm to assess CT image quality.
- Analyzed data from two clinical radiology practices.
Main Results:
- SSDE positively correlated with volumetric CT dose index (CTDIvol) and patient body mass index.
- Significant differences in image quality were observed between the two hospitals (p < 0.001).
- These image quality differences did not affect diagnostic performance in task-based protocols.
- Pre-monitoring sequence, scanner age, and scan requisition parameters influenced SSDE.
Conclusions:
- CT protocols require review for dose optimization.
- Assessing image quality is essential for ensuring consistency across different CT units and protocols when evaluating SSDE.
- Standardization of protocols may be necessary to ensure consistent diagnostic performance and radiation safety.
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