Open AccessGold seed fiducial markers for prostate radiation therapy: Describing prostate motion
Author(s) -
Brown A,
Gebski V,
BeldhamCollins R,
HardcastleFowler T,
Do V,
Turner S
Publication year - 2011
Publication title -
radiographer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 18
eISSN - 2051-3909
pISSN - 0033-8273
DOI - 10.1002/j.2051-3909.2011.tb00152.x
Subject(s) - fiducial marker , prostate cancer , medicine , prostate , nuclear medicine , gold standard (test) , radiation therapy , radiation treatment planning , radiology , cancer
Purpose : Gold seed fiducial markers can be used to accurately define daily treatment field placement for prostate cancer patients. In 2007, a small study was undertaken to evaluate the effectiveness of using gold seed fiducial markers. Methods : Eleven patients who attended for treatment had three gold fiducial markers inserted into their prostate. Daily megavoltage (MV) and kilovoltage (kV) orthogonal images were taken throughout treatment. Online correction was applied for the kV images matched to the fiducial markers daily, and the MV images were matched offline using pelvic bone anatomy. Results : 850 sets of orthogonal images were reviewed from the 11 patients. When comparing the bony anatomy imaging with the fiducial marker imaging, all patients would have had at least five treatments where the displacement exceeded 0.5 cm if treatment verification was undertaken using MV bony anatomy match. There was no trend in prostate movement throughout the patients treatment schedule (0.7 cm early and middle of treatment and 0.8 cm at the end of treatment.) Conclusion : The results have demonstrated that daily matching to fiducial markers improves treatment field placement compared with MV bony anatomy matching for patients with prostate cancer.