| Autor: |
Andrew See, John Wong, Aldo Rolfo, Steve Medwell, Michael Lim Joon, Mary Lynton-Moll, Mark Middleton |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Radiographer. 53:24-28 |
| ISSN: |
0033-8273 |
| DOI: |
10.1002/j.2051-3909.2006.tb00046.x |
| Popis: |
Given the onset of dose escalation and increased planning target volume (PTV) conformity, the requirement of accurate field placement has also increased. This study compares and contrasts a combination offline/online electronic portal imaging (EPI) device correction with a complete online correction protocol and assesses their relative effectiveness in managing set-up error. Field placement data was collected on patients receiving radical radiotherapy to the prostate. Ten patients were on an initial combination offline/online correction protocol, followed by another 10 patients on a complete online correction protocol. Analysis of 1480 portal images from 20 patients was carried out, illustrating that a combination offline/online approach can be very effective in dealing with the systematic component of set-up error, but it is only when a complete online correction protocol is employed that both systematic and random set-up errors can be managed. Now, EPI protocols have evolved considerably and online corrections are a highly effective tool in the quest for more accurate field placement. This study discusses the clinical workload impact issues that need to be addressed in order for an online correction protocol to be employed, and addresses many of the practical issues that need to be resolved. Management of set-up error is paramount when seeking to dose escalate and only an online correction protocol can manage both components of set-up error. Both systematic and random errors are important and can be effectively and efficiently managed. (author abstract) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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