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J Korean Soc Ther Radiol Oncol > Volume 22(1); 2004 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2004;22(1): 69-75.
New Fiduciary Plate and Orientation Marker for High Energy Radiation Therapy
Hong Gyun Wu, Sun Nyung Huh, Hak Jae Kim
1Department of Therapeutic Radiology, Seoul National University College of Medicne, Korea. crystalia@hanmail.net
2Institute of Radiation Medicine, Medical Research Center, Seoul National University, Korea.
3Clinical Research Center, Seoul National University Hospital, Korea.
A new fiduciary plate and orientation marker have been devised to assist the quality assurance (QA) procedures for port films in radiation therapy department. The plate is used in conjunction with the film/cassette combination during weekly QA procedures, at Seoul National University Hospital (SNUH), in order to verify treatment fields in high energy radiation therapy.
A new fiduciary plate was fabricated using an acrylic plate, cerrobend, standard blocking tray and mercury. The acrylic plate had the dimension of 1x25x25 cm, with two fiduciary markers. The plate was rigidly attached onto the standard blocking tray, thus making it easier to set the fiduciary plate to the center of the radiation field of the linear accelerator. The plate had two 2-mm vertical and horizontal lines, with the minor scales in 2-cm steps. The orientation marker was a small mercury filled disk, which was inserted into the plate.
The geometrical structure of the lines in the plate makes it easier to correlate two different images between the simulation and port films. The marker clearly indicated the orientation of the film, for example, the anterior, posterior, left, right and various oblique orientations, without the placement of a conventional orientation marker. Also, the new orientation marker could easily be applied to the simulator by placing the small orientation marker onto the image intensifier or in front of the film/cassette holder. CONCLUSIONSs: The new fiduciary plate appears to be useful in verifying the treatment fields, and the new orientation marker makes the film orientation simple, which is expected to lower the block fabrication errors.
Key Words: Port film, Quality assurance (QA), Fiduciary plate, Orientation marker
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