304 KB10 KB199220251997Ho, Anthony K...Sibata, Claudio H...Thomadsen, Bruce R...številka:3letnik:31str. 315-318ISSN:1318-2099COBISSID_HOST:7389145URN:URN:NBN:SI:doc-XP45P5HPenCroatian Medical Association - Croatian Society of RadiologySlovenian Medical Society - Section of RadiologyRadiology and oncology (Ljubljana)Dose-response relationship, radiationNeoplasmsRadiotherapyRadiotherapy planning, computer-assistedRadiotherapy, computer-assistedComparison of TDF and LQ models using the bioeffects algorithm of a treatment planning system|In this study, two examples, first with two-field AP/PA plans and second with four-field plans are evaluated for Co-60 beams using the bioeffeof the Radiation Oncology Computer System (ROCS) treatment planning system. The bioeffects algorithm enables the summation of two or more treatment plans. Biomodifier tables, which convert the values of dose per fracrtion delivered over a period of time to Time Dose Fractionation (TDF) are included with the software. The biomedifier table is a standard ROCS twodimensional table. By using the linear-quadratic (LQ) model, the biological equivalent dose versus the physical absorbed dose was determined and input as a new biomodifier table. The distribution of TDF values and the biological equivalent dose usingthe LQ model shows that the LQ model may be a better choice for a bioeffect algorithm. Furthermore, the LQ model may be implemented in the ROCS systemTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaOnkološki inštitut Ljubljana