Prior to the surgical procedure, patients underwent a comprehensive neurological assessment conducted by a neurosurgeon, followed by an evaluative Computed Tomography scan (CT; Somatom Definition AS system from Siemens, Erlangen, Germany). Defect measurements were taken in two diameters: maximal axial and maximal sagittal (mm). Subsequently, the defect area was calculated and classified according to Poukens et al. [15 (link)]. This classification is contingent upon three variables: defect size, midline crossing, and orbital rim involvement. The grades are delineated as follows: Grade I for defects not crossing the midline and measuring smaller than 5 cm2 without orbital involvement, Grade II for defects not crossing the midline and measuring larger than 5 cm2 but smaller or equal to 100 cm2 without orbital involvement, Grade III for defects not crossing the midline and measuring larger than 100 cm2 without orbital involvement, Grade IV for defects smaller than 5 cm2 with orbital involvement, Grade V for defects larger than 5 cm2 but smaller or equal to 100 cm2 with orbital involvement, and Grade VI for defects larger than 100 cm2 with orbital involvement. In addition to classification, an Aesthetic Satisfaction Scoring Scale (ANA) was employed for aesthetic evaluation [16 (link)].
Somatom definition as system
Manufactured by Siemens
Sourced in Germany
The SOMATOM Definition AS system is a computed tomography (CT) scanner designed and manufactured by Siemens. It is a versatile and flexible system that can be used for a wide range of diagnostic imaging applications. The SOMATOM Definition AS system provides high-quality images and efficient scanning capabilities, allowing healthcare professionals to make informed decisions about patient care.
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Lab products found in correlation
5 protocols using somatom definition as system
1
Cranial Defect Evaluation and Classification
2
Standardized CT Imaging Protocol
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The CT scan was performed on a SOMATOM Definition AS system (Siemens Healthineers) for each patient within 48 hours following the MRI scan. All patients were scanned axially in the supine position using the following imaging parameters: tube voltage =100 kV; tube current was determined by using Care Dose4D technology automatically; slice thickness =4.8 mm; field of view =220 mm × 220 mm; matrix size =512×512; window level =35 Hounsfield units (HU) and window width =80 HU.
3
Pelvic Radiation Simulation Protocols
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From 2008 to 2016, patients with rectal cancer receiving pre- or post-operative pelvic irradiation through 3D simulation and planning were eligible and allocated into three groups. Group 1 comprised patients who received neither OCA nor ICA during simulation (n = 14), group 2 comprised those who received OCA but not ICA (n = 23), and group 3 comprised those who received both OCA and ICA (n = 10). Simulation was performed routinely using the Siemens SOMATOM Definition AS system (Siemens AG, Wittelsbacherplatz, DE-80333, Munich, Germany) or Philips Brilliance CT Big Bore system (Cleveland, OH, USA), and the scanning range was from 5 cm below the ischial tuberosity to the upper border of L2, with 5 mm slide thickness. The scan started 35 to 45 s after intravenous bolus injection of 88 mL of the CA (Xenetix®; 65.81 g in 100 mL; GUERBET, Lanester, France) using a power injector at a rate of 2.6 mL/s. The OCA was 20 mL iohexol containing 6 g iodine (Beilu Pharmaceutical Co Ltd, Beijing, China) and was diluted in 1000 mL of water. Patients took this solution 1 hour before simulation, during which they had a full bladder and lay in the prone position on a belly board.
4
Retrospective Study of CAD Patients
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This study was approved by the University of Sharjah and University Hospital of Sharjah Ethics Committees. Patient consent was not requested by the ethics committee since it’s a retrospective study. All patient related data were fully anonymized before getting access to the data. Data for a cohort of 87 symptomatic CAD patients were arbitrarily retrieved for retrospective study. The cohort selection criteria were confined to patients who had undergone two sequential scan protocols: enhanced CCTA and unenhanced CTCS. The CCTA and CTCS examinations were performed using a 128-slice CT scanner, specifically a Siemens Somatom Definition AS system (Siemens Medical Solutions, Forchheim, Germany). Automatic exposure control with fixed tube voltage of 120-kV and provision for tube current-time product (mAs) modulation based on body parts and thickness was applied in both examinations. Prospective ECG gating with craniocaudal scan direction was performed during a single inspiratory breath-hold to acquire CTCS.
5
Standardized Dose Reporting for Brain MRgFUS
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All CT images were obtained using a SOMATOM Definition AS system (Siemens Healthineers AG) at a tube voltage of 120 kV and a radiation dose of 400 mAs. The SDR was defined based on the Hounsfield units of the cortical bone (maximum value) and bone marrow (minimum value) on CT images of the skull. For each region of the ultrasound beam unit, the SDR was automatically calculated using the ExAblate 4000 Neuro system, version 7.0 (InSightec). In total, 1024 SDR values were obtained for each patient.
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