- Title
- Validating the use of digitally reconstructed radiographs as verification tools in radiation therapy simulation of prostate treatment
- Creator
- Parker, J.; Vigar, M.; Dempsey, Shane E.; Warren-Forward, H.; Jovanovic, K.
- Relation
- The Radiographer Vol. 49, Issue 3, p. 141 - 146
- Relation
- http://www.minniscomms.com.au/radiographer
- Publisher
- Australian Institute of Radiography
- Resource Type
- journal article
- Date
- 2002
- Description
- The aim of this study was to validate the clinical usefulness of Digitally Reconstructed Radiographs (DRRs) as a replacement tool for simulator verification films in prostate treatment. Method: The study was performed on a convenience sample of 13 patients who had all undergone or were currently undergoing prone treatment to the prostate and/or seminal vesicles. All patients received 60 or 66 Gy in 30 or 33 fractions via a four-field PA/AP, Lt. and Rt. lateral field technique using 6 or 18 MV photons. The previously acquired PA and lateral simulation films were collected for each patient and a set of DRRs produced from stored CT data. In total 26 DRRs were produced and these were compared to the 26 simulation films. In order to compare and identify variation between the image sets distance measurements were taken from a single bony landmark to the isocentre in the superior-inferior (sup-inf), left-right (It-rt), and anterior/posterior (ant-post) directions. Results: In the sup-inf displacement a maximum difference of 0.4 cm was observed (correlation coefficient of r=0.96, p<0.001). In the It-rt displacement a maximum difference of 0.3 cm was observed (r=0.89, p<0.001). In the ant/post direction an outlying difference of 0.8 cm was recorded although 10 of 13 measurements were less than 0.3 cm (r=0.94, p<0.001). Conclusion: A statistically significant correlation was found between the image sets. In terms of isocentre placement, DRRs within this study accurately represented the simulation verification film and may be considered as a clinically acceptable replacement for the current simulation verification film in prostate treatment. This outcome suggests that current clinical protocols could change to incorporate the increased use of DRRs as either aids in placing planned field position within a verification simulator session or as a primary planning output replacing the current simulation verification session. This has implication for both the patient and the department.
- Subject
- radiographic image enhancement; computer-assisted radiotherapy planning; prostatic neoplasms radiotherapy
- Identifier
- uon:1351
- Identifier
- http://hdl.handle.net/1959.13/27080
- Identifier
- ISSN:0033 8273
- Full Text
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