TY - JOUR ID - 55140 TI - Dose Calculation Accuracy of AAA and AcurosXB Algorithms for Small Central and Interface Lung Lesions - Verification with Gafchromic Film Dosimetry JO - Asian Pacific Journal of Cancer Prevention JA - APJCP LA - en SN - 1513-7368 AU - Alagar, Ananda Giri Babu AU - GANESH, K.M AU - Kaviarasu, Karunakaran AD - Research and Development Centre, Bharathiar University, Coimbatore, India. AD - Department of Radiation Oncology, Krishna Institute of Medical Sciences, Secunderabad, India. Y1 - 2018 PY - 2018 VL - 19 IS - 1 SP - 253 EP - 259 KW - TPS Algorithms KW - Lung Heterogeneity KW - dose plane DO - 10.22034/APJCP.2018.19.1.253 N2 -   Dose calculation for small field radiotherapy with heterogeneity often involves discrepancies, so that algorithms used by treatment planning systems (TPS) should be evaluated with reference to achieving optimal treatment results. Accuracy of two model based algorithms, AcurosXB (AcXB) and the analytical anisotropic algorithm (AAA) from Eclipse TPS, were here tested. Measurements are made using Gafchromic EBT3 films with indigenously generated lung phantoms irradiated with 6 MV photons. Lung phantoms contained two types of tumor plugs, one kept at an interface attached to the chest wall in right lung (RIT) and the other at the centre of the left lung (LCT). RIT and LCT were studied with two different tumor diameters, 1.5 cm and 2.5 cm. Scanned images were planned in TPS with 3D-CRT, IMRT and VMAT and individual plans for each tumor were irradiated keeping the Gafchromic film at the centre of the tumor to evaluate the dose distribution in the central plane. Both algorithms, irrespective of delivery techniques, showed more deviation with smaller than larger diameter tumors. Also, both demonstrated maximum deviation at the junction of tumor and lung in both RIT and LCT cases. However, the deviation observed was higher with AAA and a minimal acceptable deviation of within 4 % was achieved with AcurosXB. UR - https://journal.waocp.org/article_55140.html L1 - https://journal.waocp.org/article_55140_6a2aed9d63626407038d776452f4f2b2.pdf ER -