Optimization of kVp and mAs for pediatric low | 合法醫療器材資訊網

由JReid著作·2010·被引用75次—Objective:TheobjectiveofourstudywastodeterminetheeffectofmAsandkVpreductiononpediatricphantomsbasedonpatientcircumferencetooptimize ...

Objective: The objective of our study was to determine the effect of mAs and kVp reduction on pediatric phantoms based on patient circumference to optimize dose reduction and maintain image quality for abdominal CT.

Subjects and methods: Three polymethylmethacrylate right cylindric CT dose index (CTDI) phantoms with diameters of 10, 16, and 32 cm simulated the abdomen of an infant, child, and adolescent, respectively. Using a National Institute of Standards & Technology ion chamber and Victoreen 660 electrometer, doses at centerline were recorded on a 16-MDCT scanner. Measurements were obtained in incremental steps from 50 to 400 mAs and from 80 to 140 kVp. Noise was calibrated to clinical images through a calibration factor.

Results: For phantoms of all circumferences, doses increased linearly with an increase in mAs and by the power function of kVp(n) for increases in kVp. The...