1/25/2024 0 Comments Airo ct scannerMevion Medical Systems has developed software, Verity™ 3D, that uses CT images from any scanner to perform 3D image registrations for proton therapy. To our knowledge, our facility is the first compact proton therapy system to use a mobile CT scanner for IGPT. The AIRO will be utilized for target localization and inter‐fraction adaptive treatment assessment. Our current IGPT workflow involves CT simulation using a Philips Big Bore 16 Slice CT Simulator with routine orthogonal kV/kV image pairs (flat‐panel detectors) preceding each treatment fraction. 13 Our study assessed the performance characteristics of the AIRO at our institution compared with IGRT systems used for intensity‐modulated radiation therapy (IMRT) and CT simulators at our institution for radiotherapy applications. The AIRO's image quality characteristics have been reported by Weir et al. PA and Left Lateral kV imaging panels are also shown with associated track. The AIRO is shown in scan mode with 100 cm max scan range and 51.2 cm image field‐of‐view. (c) Birds‐eye‐view of the treatment room. (b) Treatment room with couch in imaging position. (a) Treatment room with couch in setup position. The AIRO's motor‐controlled castors provide effortless transport from the storage location (in the maze hallway) to the scanning location. (Fig.1) 1) to avoid radiation‐induced damage to its sensitive electronics. When not in use, the AIRO is stored in the maze (Fig. The AIRO's small footprint (W × L × H: 1.94 × 1.54 × 1.90 m) occupies 1.28 m 2 of treatment floor space (in scan mode). Our institution is the first to acquire and clinically implement the AIRO Mobile CT System (AIRO) for IGPT. The AIRO Mobile CT System (Mobius Imaging LLC, Shirley, MA, USA) is a large bore (107 cm) helical 32 slice CT scanner historically utilized for intra‐operative imaging for spinal surgeries. 12 For these reasons, a small‐footprint mobile CT scanner, commonly used for image‐guided surgery, could be of great value for 3D image‐guided proton therapy (IGPT). To date, stand‐alone in‐room CT scanners utilized have had large footprints and are either not amenable to or cumbersome to use in the more compact proton therapy centers, such as the S250 (Mevion Medical Systems, Littleton, MA, USA). 9, 10, 11 Some proton vendors are developing technologies for CBCT (Proteus ®ONE, IBA, Belgium, HITACHI, Tokyo, Japan). 8 Recently, people have reported on the use of in‐room CT scanners for proton beam radiation therapy localization. Unfortunately, due to the size and geometry of proton therapy units, imaging has largely been limited to orthogonal kV/kV x‐ray systems. Patient localization accuracy is particularly important in proton beam radiation therapy due to the sharp dose fall‐off compared to conventional x‐ray therapy. 1, 2, 3, 4, 5, 6, 7 These imagers provide improved treatment accuracy over conventional orthogonal imaging allowing for increased precision in radiation delivery. Advances in in‐room computed tomography (CT) scanners and cone‐beam technology have led to the proliferation of CT localization for image guided radiation therapy (IGRT).
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