|
KMID : 1094020140310060495
|
|
Journal of Veterinary Clinics
2014 Volume.31 No. 6 p.495 ~ p.501
|
|
|
Effect of Different CT Scanner Types and Beam Collimations on Measurements of Three-Dimensional Volume and Hounsfield Units of Artificial Calculus Phantom
|
|
Wang Ji-Hwan
Lee Hee-Chun
|
|
|
Abstract
|
|
|
|
The objective of this study was to evaluate the differences and reproducibility of Hounsfield unit (HU)value and volume measurements on different computed tomography (CT) scanner types and different collimations byusing a gelatin phantom. The phantom consisting of five synthetic simulated calculus spanning diameters from 3.0mm to 12.0 mm with 100 HU was scanned using a two-channel multi-detector row CT (MDCT) scanner, a fourchannelMDCT scanner, and two 64-channel MDCT scanners. For all different scanner types, the thinnest possiblecollimation and the second thinnest collimation was used. The HU values and volumes of the synthetic simulatedcalculus were independently measured three times with minimum intervals of 2 weeks and by three experiencedveterinary radiologists. ANOVA and Scheffe test for the multiple comparison were performed for statistical comparisonof the HU values and volumes of the synthetic simulated calculus according to different CT scanner types and differentcollimations. The reproducibility of the HU value and volume measurements was determined by calculating Cohen’sk. The reproducibility of HU value and volume measurements was very good. HU value varied between differentCT scanner types, among different beam collimations. However, there was not statistically significant difference. Thepercent error (PE) decreased as the collimation thickness decreased, but the decrease was statistically insignificant. In addition, no statistically significant difference in the PEs of the different CT scanner types was found. It can beconcluded that the CT scanner type insignificantly affects HU value and the volumetric measurement, but that a thinnercollimation tends to be more useful for accurate volumetric measurement.
|
|
|
KEYWORD
|
|
|
Computed tomography, Hounsfield unit, Volume measurement, Phantom
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|