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KMID : 1164220070190020123
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Journal of Korean Society for Radiotherapeutic Technology
2007 Volume.19 No. 2 p.123 ~ p.129
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A Study for Reappearance Acording to the Scan Type, the CT Scanning by a Moving Phantom
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Choi Jae-Hyock
Jung Do-Hyeung
Choi Gye-Sook
Jang Yo-Jong
Kim Jae-Won
Lee Hui-Seok
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Abstract
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Purpose: CT scan shows that significant tumor movement occurs in lesions located in the proximity of the heart,
diaphragm, and lung hilus. There are differences concerning three kinds of type to get images following the Scan type called Axial, Helical, Cine (4D-CT) mode, when the scanning by CT. To know how each protocol describe accurately, this paper is going to give you reappearance using the moving phantom.
Materials and Methods: To reconstruct the movement of superior-inferior and anterior-posterior, the manufactured
moving phantom and the motor following breathing were used. To distinguish movement from captured images by CT scanning, a localizer adhered to the marker on the motor. The moving phantom fixed the movement of superior-inferior upon 1.3 cm /1 min. The motor following breathing fixed the movement of anterior-posterior upon 0.2 cm /1 min. After fixing each movement, CT scanning was taken by following the CT protocols. The movement of A localizer and volume-reappearance analyzed by RTP machine.
Results: Total volume of a marker was 88.2 cm3 considering movement of superior-inferior. Total volume was
184.3 cm3. Total volume according to each CT scan protocol were 135 cm3 by axial mode, 164.9 cm3 by helical mode, 181.7 cm3 by cine (4D-CT) mode. The most closely describable protocol about moving reappearance was cine mode, the marker attached localizer as well.
Conclusion: CT scan should reappear concerning a exact organ-description and target, when the moving organ is being scanned by three kinds of CT protocols. The cine (4D-CT) mode has the advantage of the most highly reconstructible ability of the three protocols in reappearance of the marker using a moving phantom. The marker on
the phantom has always regular motion but breathing patients don’t move like a phantom. Breathing education and devices setting patients were needed so that images reconstruct breathing as exactly as possible. Users should also consider that an amount of radiation to patients is being bombed.
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KEYWORD
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CT scan type, moving phantom, respiration cycle, reappearance test
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