![]() ![]() ![]() The CTDI for 4D CT for lung cancers of 19.6 ± 9.3 mGy (n = 168, mean ± 1SD) was found to be 63% higher than CTDIs for conventional CT scans for lung patients that were acquired in the same period (CTDIvol 12 ± 4 mGy, sample of n = 25). ![]() Volume CT dose index (CTDIvol) as recorded over this period was fairly constant at approximately 20 mGy for adults. Dose records were analysed retrospectively for 387 patients who underwent 4D CT procedures between 20.Ī total of 444 4D CT scans were acquired with the majority of them (342) being for lung cancer radiotherapy. All scans are performed at 140 kVp and reconstructed in 10 datasets for different phases of the breathing cycle. To review the dose delivered to patients in time-resolved computed tomography (4D CT) used for radiotherapy treatment planning.ĤD CT is used at Peter MacCallum Cancer Centre since July 2007 for radiotherapy treatment planning using a Philips Brilliance Wide Bore CT scanner (16 slice, helical 4D CT acquisition). The integration and widespread dissemination of systems that locate and target moving tumors are ongoing developments in the early 21st century, and future systems are likely to include the functionality of targeting temporally changing tumors and normal tissue physiology as well as anatomy. Real-time targeting devices to align the tumor and the radiation beam have built upon technologies of robots, multileaf collimators, and couch-based and gimbaled positioning systems. These systems are also providing new insights into the magnitude and complexity of target and normal tissue motion during a course of therapy, and are driving the development of real-time targeting systems. These are based on a diversity of modalities including radiofrequency, radioisotopes, ultrasound and MRI in addition to the optical, kilovoltage and megavoltage imaging systems available on conventional accelerators. A wide variety of real-time position monitoring systems are available or under development. 3D knowledge of the tumor position during abdominal and thoracic radiotherapy is an important component of motion management in radiation therapy. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2023
Categories |