title: [Optimization of the chest computed tomography scan by varying the position of the arms].
abstract: Computed tomography automatic exposure control (CT-AEC) technique is calculated from a localizer radiograph. When we perform neck and chest CT examination, at first, we acquire localizer radiograph and neck images by placing the arm in a lowered position. Next, the arm is raised for the chest scan. Therefore, the localizer radiograph and subject information are different in the chest scan. In this situation, the chest scan with the use of the CT-AEC causes radiation over-dose. The purpose of this study is to optimize the CT-AEC by controlling noise index (NI), and make a chest CT scan condition considering the position of the arms. We measured the image noise (SD) in the phantom by using CT-AEC. In addition, dose length product (DLP) was recorded. Moreover, we examined the correlation with the clinical images. The results of our experiments show that radiation dose can be reduced with the image quality kept by controlling NI.
authors: Department of Medical Technology, Tsuchiya General Hospital.
authors: Yoriaki
authors: Y
authors: Matsumoto
authors: Takanori
authors: T
authors: Masuda
authors: Naoyuki
authors: N
authors: Imada
authors: Naoya
authors: N
authors: Maruyama
authors: Satoshi
authors: S
authors: Inada
authors: Tooru
authors: T
authors: Ishibashi
authors: Tomoyasu
authors: T
authors: Satou
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001132:Arm / Q000502:physiology*; D016477:Artifacts; D005260:Female; D006801:Humans; D008297:Male; D019047:Phantoms, Imaging; D011187:Posture; D011829:Radiation Dosage; D013902:Radiography, Thoracic / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*