Audit of radiation dose delivered in time‐resolved four‐dimensional computed tomography in a radiotherapy department
作者： Patricia Hubbard , Jason Callahan , Jim Cramb , Ray Budd , Tomas Kron
关键词: Four-Dimensional Computed Tomography 、 Radiotherapy department 、 Lung cancer 、 Lung 、 Medicine 、 Radiation dose 、 Radiation therapy 、 Nuclear medicine 、 Significant difference 、 Radiology 、 Breathing
摘要: Introduction To review the dose delivered to patients in time-resolved computed tomography (4D CT) used for radiotherapy treatment planning. Methods 4D CT is at Peter MacCallum Cancer Centre since July 2007 planning using a Philips Brilliance Wide Bore scanner (16 slice, helical 4D acquisition). All scans are performed 140 kVp and reconstructed 10 datasets different phases of breathing cycle. Dose records were analysed retrospectively 387 who underwent procedures between 2013. Results A total 444 acquired with majority them (342) being lung cancer radiotherapy. Volume index (CTDIvol) as recorded over this period was fairly constant approximately 20 mGy adults. The CTDI cancers 19.6 ± 9.3 mGy (n = 168, mean ± 1SD) found be 63% higher than CTDIs conventional that same (CTDIvol 12 ± 4 mGy, sample n = 25). length product (DLP) increased increasing field view; however, no significant difference DLPs indications (breast, kidney, liver lung) could found. Breathing parameters such rate or pattern did not affect dose. Conclusion 4D can less twice one required scanning.
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