Optimizing CT Scan image quality in a lean adult
Fig. 1: NECT was done using auto kVp and auto reference mAS selection. The acquired image is grainy, but of sufficient quality for a plain scan.
Fig 2. CECT (hepatic venous phase) was done at fixed kVp and manual selection of higher reference mAs.
Problems in CT image quality while scanning lean / emaciated adult
With auto kVp and auto mAS, the lean patients that weigh 50 kg or low may have a grainy image quality due auto selection of low kVp and mAS.
This affects the scan quality and interpretation.
Strategy:
- Use higher reference mAS or switch of the auto mAS in patient who are above 45 years
- Fix the kVp to your choice. For venous phase, make it 100 kVp
- Reconstruct images at 2 mm or more thin section, instead of 1 mm
What about increase in Radiation dosage:
One should always weigh the risk vs benefit ratio. To reduce the risk of radiation, we should not compromise the quality and eventual benefit to the patient
Prepared by Dr. Sharad Maheshwari
prepared on 29.10.2022
Updated:
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