Siemens SOMATOM Sensation Open CT Scanner (Siemens Medical Systems, Germany) was utilized for computed tomography (CT) of all the patients. CT images of 3.0 mm slice thickness were acquired extending from L2 to proximal third femoral diaphysis. All patients were scanned with full bladder as per institutional protocol.
Somatom sensation open ct scanner
Manufactured by Siemens
Sourced in Germany
The SOMATOM Sensation Open CT Scanner is a computed tomography (CT) imaging system manufactured by Siemens. The device is designed to acquire high-quality cross-sectional images of the human body using advanced X-ray technology. The core function of the SOMATOM Sensation Open is to provide detailed visualization of internal anatomical structures for diagnostic and clinical purposes.
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5 protocols using somatom sensation open ct scanner
1
Whole-Body CT Imaging Protocol
2
Cervix Carcinoma Radiotherapy Techniques
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A cohort of thirty patients suffering with cervix carcinoma (stages II–IIIB) and treated using RA and IMRT techniques were selected retrospectively. The appropriate accessories were used for patient immobilization and reproducibility of the treatment setup. The computed tomography (CT) scans were executed with a Siemens SOMATOM Sensation Open CT Scanner (Siemens Medical Systems, Germany) with full bladder as per departmental protocol using slice thickness of 3.0 mm. The target volume delineation was performed on the CT images as per the Radiation Therapy Oncology Group (RTOG) guidelines.[17 ] The clinical target volume (CTV) included the cervix, uterus, and pelvic nodes including presacral and parametrial tissues. A margin of 5.0 mm was used isotropically to CTV to create PTV. The following OARs were also delineated: bowel, bladder, rectum, and femoral heads as per the standard RTOG definitions. The radiation treatment plans were optimized to deliver a prescription dose (PD) of 50.4 Gray (Gy) to the PTV in 28 fractions. The planning goal was to distribute 100% PD to the 95% of PTV with no more than 5% of PTV volume receiving 110% of PD. The dose to bladder and rectum was optimized in such a manner that V50 Gy (volume receiving 50 Gy) should be less than 50% of OAR volume.
3
Multimodal Cardiac Radiotherapy Planning
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Following informed consent to treatment by cRA, the patient underwent 4D computed tomography for treatment planning performed with a SOMATOM Sensation Open CT scanner (Siemens) as well as a contrast-enhanced electrocardiogram (ECG)-triggered cardiac CT (SOMATOM Definition Flash, Siemens) for co-registration in the treatment planning system (Varian Eclipse version 15.5; Varian Medical Systems Inc. Paolo Alto CA, USA). A pre-specified internal target volume (ITV) for respiratory motion management was enlarged by 4 mm to result in the planning target volume (PTV), which consisted of 104 cm3. The treatment planning procedure and consideration of organs at risk followed the protocol of the RAVENTA study.9 (link) Target volume transfer from the electroanatomic mapping (see Supplementary material online , Figure S2 ) to the treatment planning system was accomplished using the CARDIO-RT software.10 (link) Dose distribution was calculated using the AAA/Acuros AXB algorithm and cRA was performed on a Varian TrueBeam STX in four non-coplanar volumetric modulated arcs using a 6 mV flattening filter-free photon beams.
4
Postmortem CT Scanning Protocols
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AMCTs of the head had been performed on several different CT scanners by different manufacturers, using different scanning protocols, each according to the individual hospital's protocols. All PMCTs (except two) had been performed on a 128-slice Somatom Definition Flash Dual Source CT scanner (Siemens Healthcare, Forchheim, Germany). Scan parameters were as follows: 120 kVp; automatic dose modulation (CARE Dose4D, Siemens Healthcare, Forchheim, Germany); 0.6 mm collimation. Two PMCTs were performed on a Somatom Sensation Open CT scanner (Siemens Healthcare, Forchheim, Germany) during maintenance service of the other scanner. Scan parameters were as follows: 120 kVp; 300 mAs; 1.2 mm collimation, using a dedicated head field of view. PMCT image reconstruction was performed with a slice thickness of 0.6 mm in increments of 0.4 mm using soft tissue and bone-weighted tissue kernel in all cases [8] .
5
Liver SBRT Imaging and Treatment
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20 patients (Table 1), diagnosed with liver metastases or hepatocellular carcinoma (HCC) and previously treated with liver SBRT, were included in this retrospective study. The planning CT image acquisition and fractionated treatments involved the positioning of patients in a stereotactic body frame (SBF) (Elekta Instrument AB, Sweden) with abdominal compression to reduce respiratoryinduced tumor motion. The tumor and surrounding OARs were delineated in the large planning CTs (including lungs) that were enhanced with contrast in only 7 patients. For rest of the patients, only short (spanning only liver) planning CTs were acquired with contrast. The tumor delineation from such short CTs were transported to the larger non-contrast planning CTs that were used for OAR delineations. Only large planning CTs were used in this study. On each treatment day, prior to dose delivery, a contrast-enhanced CT scan was acquired to establish the position of the tumor in the SBF. This position was used to calculate the setup correction vector for the alignment of the tumor and the treatment beams. The dataset of each patient was acquired using Siemens SOMATOM Sensation Open CT scanner (Erlangen, Germany), and included 1 planning CT and 3 or 6 repeat CT scans with slices of 512 Â 512 pixels, thickness of 2.5 mm and in-plane pixel size of 0.98-1.27 mm.
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