Comparison of two repositioning devices used during radiation therapy for Hodgkin's disease

Simulator Verification of the Accuracy of Patient Repositioning after Virtual Simulation

“…Patients who received a prone pillow or belly board also had a significantly higher repositioning accuracy than those positioned without special immobilization devices. These results are very well reproducible [4,5,10,20] and support the use of standard positioning aids whenever possible.…”

“…In a recent analysis using portal imaging, Bakai et al [1] found a median isocenter displacement of 1.7-4.5 mm, depending on the direction. Generally, (re)positioning accuracy depends on the quality of immobilization techniques and devices [4,5,10,20]. Especially in multi-isocenter treatment, setup errors can lead to considerable under-and overdosages at the field junctions [14].…”

Frameless Stereotactic Radiosurgery of a Solitary Liver Metastasis Using Active Breathing Control and Stereotactic Ultrasound

“…Repositioning, however, is not very reliable [3,12] and several attempts to correctly reposition the patient are usually necessary [12]. Often, treatment planning and treatment are therefore done without removing the patient from the body frame [32].…”

“…The CTV was further expanded to a PTV because of the geometric uncertainties using the calculation method described in [12] with a lateral margin of approximately 5 mm and a craniocaudal margin of approximately 1 cm. Total volume of the PTV was therefore approximately 100 cm 3 .…”

“…In addition, there are different possibilities to limit organ motion, including, e.g., stereotactic body frames [5,35], vacuum mattresses [25] or alpha cradles [3] and abdominal compression which, however, do not totally eliminate motion. Respiratory gating, tumor immobilization during the breathing cycle (active breathing control (ABC ® ) [6,19,34], or the passive deep inspiratory breath hold [10,20,24] can increase the overall precision when combined with conformal or image-guided radiotherapy (IGRT) [6,23,30].…”