The influences of tube voltage and scan direction on combined tube current modulation: a phantom study.

Pediatric Radiology
Hyun Woo Goo, Dong Soo Suh

Abstract

For the optimum application of tube current modulation in paediatric CT it is important to know the influences of different imaging parameters on it. This phantom study was performed to evaluate the influences of tube voltage and scan direction on combined tube current modulation, which is a combination of angular and z-axis modulation. Sixteen-slice spiral CT with combined tube current modulation was performed using four different phantoms (one adult-size anthropomorphic phantom and three cone-shaped acryl phantoms) at three different tube voltages (80, 100 and 120 kVp) and two scan directions (craniocaudal and caudocranial). Effective tube current-time product (mAs) was chosen to maintain a consistent CTDIvol for each phantom. Other parameters, including detector collimation, slice width, pitch, reconstruction algorithm, scan field of view, and scan range were identical for each phantom. Changes in CTDIvol and mAs resulting from the modulation were calculated and compared. Changes in CTDIvol and mAs resulting from the modulation were different among the three tube voltages. In larger phantoms the greatest reductions (-6.1+/-3.9% in CTDIvol and -12.5+/-4.0% in mAs) were obtained with 120 kVp, whereas in smaller phantoms they w...Continue Reading

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Citations

Mar 17, 2010·Radiation Protection Dosimetry·Marcus Söderberg, Mikael Gunnarsson
Sep 6, 2011·Radiologic Clinics of North America·Hyun Woo Goo
Nov 16, 2016·The British Journal of Radiology·Deborah MerzanRobert Bujila
Oct 30, 2012·Acta Radiologica·Hyun Woo Goo
Jan 17, 2012·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hyun Woo Goo
Mar 6, 2015·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hyun Woo Goo
Jan 5, 2010·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hyun Woo Goo
Apr 25, 2017·Pediatric Radiology·Peter K T HuiSuvipaporn Siripornpitak
Jan 24, 2019·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Sun Hwa HongUNKNOWN Asian Society of Cardiovascular Imaging Congenital Heart Disease Study Group
Mar 4, 2021·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·S SookpengA Krisanachinda

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