|
KMID : 1131320140160020139
|
|
Journal of Korean Society of Computed Tomographic Technology
2014 Volume.16 No. 2 p.139 ~ p.150
|
|
|
The study on functions of Automatic and semi-Automatic in Automatic Tube Voltage Selection software
|
|
Lee Hye-Jin
Kim Hong-Sik
Lim Ki-Bin
Kang Sung-Ho
Lee Jae-Sik
|
|
|
Abstract
|
|
|
Purpose : When using Automatic Tube Voltage Selection (ATVS), the comparative analysis of the phantom study by the quality of the images and dose at each step of automatic and semi-automatic functions, will be examined for differences
Materials and methods : The sample mixed with contrast medium and saline is positioned between the thorax and abdomen phantom so that HU (Hounsfield unit), Noise and SNR can be measured by changing the set value of Ref. kV in the 1, 3, 5, 7, 9, 11 stages with the following cases whether the automatic and semi-automatic functions in ATCM and ATVS are used or not.
After Phantom scanning for dosimetry, the value of CTDIDLP(dose length production) displayed on the device was used to measure it.
Result : Noise was increased in stages from the group using the Automatic ATVS and ATCM. It was similar to the distributions measured value of 100kVp after using 120 ref. kV setting and 100kVp, 120kVp after use when it was set 140 ref. kV in group using Semi-automatic. In the value of HU and SNR, all groups showed different distributions.
In the group using the Automatic ATVS and ATCM, doses were reduced as the level increases. In the group using Semi-automatic ATVS, doses were decreased at 100kVp after using 120 ref. kV setting and 100kVp, 120kVp after it was set to 140 ref. kV.
Conclusion : In terms of using ATVS software, a more cautious approach is needed in order to obtain the quality of images and dose-reduction effects, that the inspector had expected. Also, changing the value of Ref. kV setting and the function of a Semi-automatic have to be considered to use cautiously.
|
|
|
KEYWORD
|
|
|
ATVS(Automatic Tube Voltage Selection), Automatic Tube Current Modulation(ATCM), Radiation dose, SNR(signal to ratio)
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|