Keywords
conformal radiotherapy
digital radiography
immobilization
prostate cancer
How to Cite
Abstract
Introduction: Positioning uncertainties are found in patients during treatment of radiotherapy. This study was conducted in order to show the experience in our center.
Methods: 316 patients were analyzed in the period from March 17 to June 18, 2010, which compared the images DRR (Digitally Reconstructed Radiographs) with radiological images either by X-ray film or digital image for performing
corrections in the three axes.
Results: 809 images were recorded in 316 patients, mostly in prostate cancer. En 91% of the images made no corrections required during the treatment,
positioning corrections in all three axes (X, Y, Z) was 3.4 mm, however corrections of 5 mm or more in obesity patients was found.
Conclusion: In this study we found a suitable reproduction for our patients during treatment with uncertainties positioning similar to those reported
in the literature, the greater quantity was founded in patients treated with prostate cancer. Special attention should be paid in obese and very thin
patients who may require improved immobilization technique.
Ploeger LS, Frenay M, Betgen A, van Herk M. Application of video imaging for improvement of patient set-up. Radiother Oncol. 2003;68:277-84.
Bert C, Metheany KG, Doppke KP, Powell SN. Clinical experience with a 3D surface patient setup system for alignment of partial-breast irradiation patients. Int J Radiat Oncol Biol Phys. 2006;64:1265-74.
Krengli M, Gaiano S, Mones E, Beldi D, Loi G. Reproducibility of patient
setup by surface image registration system in conformal radiotherapy of
prostate cancer. Radiation Oncol. 2009;4:1-10.
Serago EF, Buskirk SJ, Gale A, Earle J. Comparison of daily megavoltaje electronic portal imaging or kilovoltaje imaging with marker sedes to ultrasound imaging or skin mars for prostate localization and treatment positioning in patients with prostate cancer. Int J Radiat Oncol Biol Phys. 2006;65:1585-92.
Cranmer G. A treatment planning investigator into the dosimetric effects of systematic prostate patient rotational set-up errors. Med Dosim. 2008; 33:199-205.
Gordon J, Crimaldi A, Hagan M, Siebers J. Evaluation of clinical margins in simulation of patient setup errors in prostate IMRT treatment plans. Med Phys. 2007;34:202-14.
Kupelian PA, Lee C, Meeks SL. Evaluation of image-guidance strategies in the treatment of localized prostate cancer. Int J Radiat Oncol Biol Phys. 2008;70:1151-7.
Hurkmans CW, Remeijer P, Leberque J, Mirjnheer B. Set-up verification using portal imaging; review of current clinical practice. Radiother Oncol. 2001;58:105-20.
Fiorino C, Reni M, Bolognesi A, Calandrino R. Set-up error in supinepositioned patients immobilized with two different modalities during conformal radiotherapy of prostate cancer. Radiother Oncol. 1998; 49:133-41.
Wong JR, Gao Z, Uematsu M, Merrick S, Cheng CW. Interfractional prostate shifts: Review of 1870 computed tomography (CT) scans obtained during image-guided radiotherapy using CTon rails for the treatment of prostate cancer. Int J Radiat Oncol Biol Phys. 2008;72:1376-401.
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