An equivalent square method for irregular photon fields

✍ Scribed by Angelo F. Monti; Angelo Ostinelli; Milena Frigerio; Stefania Gelosa

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 366 KB
• Volume: 20
• Category: Article
• ISSN: 0958-3947
• DOI: 10.1016/0958-3947(95)02005-5

✦ Synopsis

A quick formula is proposed for calculating equivalent squares of irregularly shaped photon fields. No complex calculations are required. Three different energies (60Co; 6 MV and 18 MV x-rays) were investigated. Comparison with results utilizing the Clarkson technique (60Co) and with experimental measurements (6 MV and 18 MV x-rays) indicates that the method is accettable in a wide variety of clinical situations. The applied procedure introduces an indetermination lower than 4%, with maximum absolute percentage errors of 3%, 2.7%, and 3.6% for 6 MV, 18 MV, and 60Co photon fields respectively.