|
KMID : 0357520170400040567
|
|
Journal of Radiological Science and Technology
2017 Volume.40 No. 4 p.567 ~ p.573
|
|
|
Evaluation of Image Quality According to Presence or Absence of Upper limbs in Scan Field of View During CT Examinations (Including LUNG MAN)
|
|
Zhang Yu Ying
Zheng Hao-Yang
Jung Kang-Kyo
Cho Yu-Jin
Cho Pyong-Kon
|
|
|
Abstract
|
|
|
The purpose of this study was to evaluate whether or not there was artifact when the upper limb could not be lifted to the top of the head during multi-detector computed tomography(MDCT) scans of the chest and abdomen. Contrast radiography of the human and chest phantom was performed with 128channal MDCT. Under the same conditions(120 kVp, 110 mAs, standard algorithm)both hands lifted up and put down each time in the human experiment. In the chest phantom experiment, the radiography was carried out when the upper limb phantom was adjusted at a certain distance(0, 3, 7 cm) from the chest phantom. Subsequently, the values of Noise, CT number, SNR, and CNR were measured in the field of concern. The noise value of fat, rib, and muscle increased when the arm was lifted in humans(0.79, 47.8, 27%). Furthermore, when the upper limb was lowered, the noise value of muscle and lung increased in the phantom(31.2, 9.4%).
In addition, the noise value of the muscles and lung decreased by 5, 25.12% and 5.6, 15.35% as the upper limb moved about 0,3,7cm away from the chest. When the chest and abdominal radiography were performed, in the case of the presence of other parts outside the inspection area, the probability of artifact was minimal while the distance was more than 3cm away from the upper limb to the chest and abdomen.
|
|
|
KEYWORD
|
|
|
Multi-detector computed tomography, CT number, Chest phantom, Noise, Artifact
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|