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KMID : 0357520070300020153
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Journal of Radiological Science and Technology
2007 Volume.30 No. 2 p.153 ~ p.159
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Practicability Assessment of Spherical Mechanical Check Device(SMCD)
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Lee Byoung-Gu
Han Dong-Kyoon
Ko Shin-Gwan
Yang Dae-Sik
Kweon Young-Ho
Han Dong-Kyoon
Ko Shin-Gwan
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Abstract
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Digital medical image commenced with an introduction of PACS has become more popular today in the radiation diagnosis and radiation treatment and made great progress, in particular, for medical testing field, whereas it has made slow progress for radiation treatment field. In order to accommodate the current trend of digital from analog, a spherical mechanical check device(SMCD) that is the form of spherical differing from the existing form of flat or cube has been designed and tested its practicability to replace the part in mechanical check with digital image from QA operation. If the distance maintains constance between source(target) and image detector with constant distance to the center of spherical mechanical check device(SMCD), the size will be shown as a constant image at all times regardless of its direction exposed. For the test, two accurate hemispheres are made and put together which results in a sphere of the equilateral circle. It enables a variety of implementation of the existing mechanical check using digital image as follows: congruity level of radiation field and light field, size accuracy of radiation field and collimation field, gantry rotation isocenter check, collimation rotation isocenter check, room laser accuracy check, collimation rotation angle check, couch rotation angle check, and more. In addition, it has proved its practicability in checking isocenter congruity level as real time at the time of simultaneous rotation between gantry and couch that is applied to the non-coplanar field, which had been hard to apply as a device formed of existing flat or cube.
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KEYWORD
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digital image base mechanical check, Spherical mechanical check device(SMCD)
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