1. Contrast media-assisted visualization of brain metastases by kilovoltage cone-beam CT
- Author
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Hiroshi Igaki, Kenshiro Shiraishi, Kuni Ohtomo, Keiichi Nakagawa, Kentaro Yamamoto, Tsuyoshi Onoe, Akihiro Haga, Nakashi Sasano, Kiyoshi Yoda, Atsuro Terahara, and Hideomi Yamashita
- Subjects
medicine.medical_specialty ,business.industry ,media_common.quotation_subject ,Isocenter ,Soft tissue ,Image registration ,Hematology ,General Medicine ,Visualization ,Oncology ,Hounsfield scale ,medicine ,Contrast (vision) ,Radiology, Nuclear Medicine and imaging ,Medical physics ,Nuclear medicine ,business ,Process (anatomy) ,Cone beam ct ,media_common - Abstract
The latest linear accelerator equipped with a kilovoltage (kV) cone-beam CT (CBCT) unit is useful for registration at the time of treatment, and thus reduces the setup error [1 4]. But in the case of intracranial or abdominal tumors, the contours of the tumors are difficult to determine on the CT images without contrast media, since such tumors are located next to normal soft tissue whose Hounsfield unit is close to those of the tumors themselves. Image registration by CBCT is performed based on the bony structures or soft tissue around the tumor. But this process does not necessarily guarantee that the position of the isocenter at treatment is identical with that at the time of planning CT, since bone or soft-tissue registration is based on a volume-matching process. It is difficult to know the exact tumor location for a low-contrast tumor even if on-board registration of the tumor is intended, since the tumor contour is not well visualized even on planning CT images without contrast media. We attempted to visualize metastatic brain
- Published
- 2009
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