PURPOSE: To determine the best treatment technique for patients with retinoblastoma requiring radiotherapy to the whole eye. METHODS AND MATERIALS: Treatment plans for 3 patients with retinoblastoma were developed using 10 radiotherapy techniques including electron beams, photon beam wedge pair (WP), photon beam three-dimensional conformal radiotherapy (3D-CRT), fixed gantry intensity-modulated radiotherapy (IMRT), photon volumetric arc therapy (VMAT), fractionated stereotactic radiotherapy, and helical tomotherapy (HT). Dose-volume analyses were carried out for each technique. RESULTS: All techniques provided similar target coverage; conformity was highest for VMAT, nine-field (9F) IMRT, and HT (conformity index [CI] = 1.3) and lowest for the WP and two electron techniques (CI = 1.8). The electron techniques had the highest planning target volume dose gradient (131% of maximum dose received [D(max)]), and the CRT techniques had the lowest (103% D(max)) gradient. The volume receiving at least 20 Gy (V(20Gy)) for the ipsilateral bony orbit was lowest for the VMAT and HT techniques (56%) and highest for the CRT techniques (90%). Generally, the electron beam techniques were superior in terms of brain sparing and delivered approximately one-third of the integral dose of the photon techniques. CONCLUSIONS: Inverse planned image-guided radiotherapy delivered using HT or VMAT gives better conformity index, improved orbital bone and brain sparing, and a lower integral dose than other techniques.
PURPOSE: To determine the best treatment technique for patients with retinoblastoma requiring radiotherapy to the whole eye. METHODS AND MATERIALS: Treatment plans for 3 patients with retinoblastoma were developed using 10 radiotherapy techniques including electron beams, photon beam wedge pair (WP), photon beam three-dimensional conformal radiotherapy (3D-CRT), fixed gantry intensity-modulated radiotherapy (IMRT), photon volumetric arc therapy (VMAT), fractionated stereotactic radiotherapy, and helical tomotherapy (HT). Dose-volume analyses were carried out for each technique. RESULTS: All techniques provided similar target coverage; conformity was highest for VMAT, nine-field (9F) IMRT, and HT (conformity index [CI] = 1.3) and lowest for the WP and two electron techniques (CI = 1.8). The electron techniques had the highest planning target volume dose gradient (131% of maximum dose received [D(max)]), and the CRT techniques had the lowest (103% D(max)) gradient. The volume receiving at least 20 Gy (V(20Gy)) for the ipsilateral bony orbit was lowest for the VMAT and HT techniques (56%) and highest for the CRT techniques (90%). Generally, the electron beam techniques were superior in terms of brain sparing and delivered approximately one-third of the integral dose of the photon techniques. CONCLUSIONS: Inverse planned image-guided radiotherapy delivered using HT or VMAT gives better conformity index, improved orbital bone and brain sparing, and a lower integral dose than other techniques.
Authors: Steven M Nguyen; Julian Sison; Marjorie Jones; Jesse L Berry; Jonathan W Kim; A Linn Murphree; Vanessa Salinas; Arthur J Olch; Eric L Chang; Kenneth K Wong Journal: Int J Radiat Oncol Biol Phys Date: 2018-12-08 Impact factor: 7.038
Authors: Iñigo San-Miguel; Ruth Carmona; Luis Luque; Raquel Cabrera; Marta Lloret; Francisco Rutllan; Pedro Carlos Lara Journal: Rep Pract Oncol Radiother Date: 2016-05-07
Authors: Kent W Mouw; Beow Y Yeap; Paul Caruso; Aaron Fay; Madhusmita Misra; Roshan V Sethi; Shannon M MacDonald; Yen-Lin Chen; Nancy J Tarbell; Torunn I Yock; Suzanne K Freitag; John E Munzenrider; Eric Grabowski; Michelle Katz; Karen Kuhlthau; Dawn DeCastro; Gena Heidary; Jessica Ciralsky; Shizuo Mukai; Helen A Shih Journal: Adv Radiat Oncol Date: 2017 Jan-Mar