Phillips brilliance big bore ct scanner

After obtaining institutional review board (IRB) approval from the University of Kansas Cancer Center, Kansas City, KS, 20 peripherally located Stage I‐II NSCLC patients who underwent MC‐based lung SBRT treatment were included in this retrospective study. The CT simulation was performed on a 16 slice Phillips Brilliance Big Bore CT scanner (Philips Healthcare, Andover, MA) and the patient was immobilized using BlueBAG BodyFIX system (Medical Intelligence, Schwabmuenchen, Germany) in the supine position with abdominal compression. Motion management was done using Philips bellows (Philips Healthcare) for the 4D CT scans. The 4D CT images were acquired with 512×512 pixels at 2 mm slice thickness and 2 mm slice spacing. All 10 phases of DICOM 4D CT datasets were then electronically transferred to the Brainlab iPlan TPS for contouring purposes. Maximum intensity projection (MIP) and mean intensity projection (MeanIP) images were then created in the iPlan TPS and autofused with each phase of 4D CT images. Internal target volume (ITV) was delineated on MIP images of the 4D CT scans. PTV was generated from ITV with 5 mm uniform margin; PTV ranged from 11.1 to 163.0 cc (mean=46.1±38.7 cc). The critical structures, such as bilateral lungs excluding the ITV (total normal lung), heart, ribs, esophagus, and spinal cord, were delineated on the MeanIP images of the 4D CT scans.

Eighteen centrally located Stage I‐II non‐small cell lung cancer (NSCLC) patients who underwent MC‐based lung SABR at the University of Kansas Hospital, Kansas City, KS were included in this retrospective study. The simulation was performed on a 16 slice Phillips Brilliance Big Bore CT Scanner (Philips Healthcare, Andover, MA) and patient in the supine position was immobilized using BlueBAG BodyFIX system (Medical Intelligence, Schwabmuenchen, Germany) with an abdominal compression. Motion management was done using PHILIPS bellows (Cleveland, OH) for 4D CT scans. The 4D CT images were acquired with 512×512 pixels at 2 mm slice thickness and 2 mm slice spacing. All phases of DICOM 4D CT datasets were then electronically transferred to the BrainLAB iPlan TPS for contouring purposes. Maximum intensity projection (MIP) and mean intensity projection (average) images were then created in iPlan TPS and auto‐fused with each phase of 4D CT images. Internal target volume (ITV) was delineated on MIP images of the 4D CT scans. PTV was generated from ITV with 5 mm uniform margin with mean volume 36.8±20.7 cc (ranged from 10.0 to 99.9 cc). The critical structures, such as bilateral lungs excluding the ITV (ipsi‐lung), heart, esophagus, and spinal cord, were delineated on the average images of 4D CT scans.