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Somatom definition as scanner

Manufactured by Siemens
Sourced in Germany

The SOMATOM Definition AS is a computed tomography (CT) scanner developed by Siemens. It is designed to provide high-quality medical imaging for diagnostic purposes. The scanner utilizes advanced technology to capture detailed images of the body's internal structures.

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24 protocols using somatom definition as scanner

1

Chest CT Scanning Protocol Optimization

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The scanning parameters were taken from AAPM’s Alliance for Quality CT protocol recommendations for the Siemens SOMATOM Definition AS scanner.[9 ] The superior and inferior aspects of the scan volume were the top and bottom of the lungs, respectively, with 20 mm of over-scanning both superiorly and inferiorly. MC simulations of chest protocols for each phantom were performed using the following scanning parameters: a tube voltage of 120 kV, a nominal collimation of 19.2 mm (32 × 0.6 mm collimation using the z flying focal spot; the measured beam FWHM is 23.8 mm), body bowtie filter, CAREDose4D AEC scheme with “Average” setting, quality reference mAs (QRM) of 25, a tube rotation time of 0.5 s, and a pitch of 1. All MCNPX simulations were also performed in accordance with this protocol.
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2

Aortic Arch Sterilization Impact on Geometry

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All aortic arch templates were CT-scanned before and after the sterilization process to assess changes in geometry due to sterilization. A SOMATOM Definition AS scanner (Siemens, München, Germany) with thorax settings was utilized for acquisition. All CT scans had a layer thickness of 0.6 mm. The CT-scanned models were segmented and exported as STL files using the 3D Slicer. The next stage was to compare pre-and post-sterilization meshes geometrically and dimensionally. The morphological comparison was processed in CloudCompare software.
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3

Chest CT Examinations for Nodule Evaluation

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Chest CT examinations were performed at our institution with the Sensation 64 scanner (Siemens Healthcare) or the Somatom Definition AS scanner (Siemens Healthcare). The Contrast-enhanced CT scan parameters were as follows: contrast medium, inhexol; tube voltage, 120 kVp; tube current, 250–350 mA; slice thickness, 1.5 mm; slice interval, 1.5 mm; matrix, 512 × 512; field of view (FOV, 35–50 cm; pitch, 1.078; reconstruction algorithm, standard. The arterial phase of the target nodule which was pathologically confirmed or under follow-up was selected for reconstruction.
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4

Multi-Modal Imaging for Respiratory-Gated RT

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Respiratory correlated 4DCT with intravenous contrast injection was performed for all patients on a SOMATOM Definition AS scanner (Siemens Healthineers, Germany). 4DCT image data were phase-sorted into ten phase bins throughout a respiratory cycle based on an external respiratory signal monitored with Real-Time Position Management (RPM, Varian Medical Systems, Palo Alto, CA). The slice separation in each phase of the 4DCT was 2mm. The image resolution in each slice was 512 × 512 pixels and a pixel size of 0.98 × 0.98 mm.
In addition, MR scans in deep inspiration breath-hold without visual guidance were performed for all patients to achieve better visualization of the tumor. The MR images (T1 VIBE with intravenous contrast, T1 FL2D, T2 HASTE, TrueFISP) were acquired in a 1.5T SIEMENS MAGNETOM Avanto scanner (Siemens Healthineers, Germany).
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5

Malignant Lymph Node Detection Protocol

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All patients underwent scanning on a Somatom Definition AS scanner (Siemens Healthcare, Erlangen, Germany). Breath-hold training was performed before each examination. All patients were asked to hold their breath at the end of inspiration as long as possible. All injections were performed with an automatic power injector with which 90 ml of contrast medium (Optiray 350 mgI/ml; Mallinckrodt Medical, St. Louis, MO, USA) was injected into the antecubital vein at a rate of 4 ml/s. Contrast-enhanced images were acquired at 90 s after injection. Imaging was performed from the thoracic inlet to the middle portion of the kidneys. Scanning parameters were as follows: 120 kVp, dose modulation ACS (Brilliance-iCT), or 50–100 mA (GE HD750 and Somatom Definition AS), slice thickness 1 mm; matrix 512×512 and standard resolution algorithms.
Various CT scanning criteria have been used to define malignant involvement of lymph nodes, and there is no node size that can reliably determine the stage. In the present study, a short-axis lymph node diameter of ≥1 cm on a CT scan was chosen as the criterion for malignancy due to its wide use in clinical practice (8 (link), 9 (link)).
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6

Lung Tumor Segmentation on CT Scans

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Thin-section CT scans of the lungs were obtained at full inspiration by the SOMATOM Definition AS scanner (64×0.625 mm detector, 1.0 pitch; Siemens, Germany) or a Brilliance 40 scanner (40×0.625 mm detector configuration, 0.4 pitch, Philips, The Netherlands) with 120 KVp of tube energy and 200 mAS of effective dose. A medium sharp reconstruction algorithm was utilized for image reconstruction with a section thickness of 1 mm and a 0.7-mm increment. All CT scans were performed without contrast medium. The identified CT scans were downloaded from the Picture Archiving and Communication Systems (PACS) (Figure S1B).
We used the open-source platform (3D-slicer, v4.9.0, www.slicer.org) to achieve tumor segmentation via the “segment editor” model. Tumors were delineated on the CT images in horizontal, sagittal, and coronal planes using a semi-automatic segmentation based on “level tracing” and “smoothing”. A radiologist and a thoracic surgeon then reviewed all tumor segmentations in consensus, and any discrepancies were resolved by additional correction.
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7

Multimodal Imaging of Brain Structures

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The CT data sets were acquired with a SOMATOM Definition AS+ scanner (Siemens) and commercially available software (Syngo CT; Siemens) with the following parameters: tube current, 38 mA; tube voltage, 120 kV; collimation, 0.6 mm; pitch, 0.55; slice thickness, 600 µm.
The MRI data sets (T2 constructive interference in steady states) were acquired with a Skrya 3-T or Prisma 3-T magnetic resonance scanner (Siemens) and commercially available software (Syngo MR; Siemens) with the following parameters: repetition time, 7.35 ms; echo time, 3.17 ms; matrix, 384 × 384; field of view, 180 × 180; slice thickness, 600 µm.
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8

Abdominal CT Scanning Protocol

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CT examination was performed on a SOMATOM Definition AS+ scanner (Siemens Healthcare, Erlangen, Germany) with the following parameters: 120 kVp; variable tube current (160-600 mA) depending on the size of the patient; detector collimation, 128×0.6 mm; algorithm, B30; reconstructed thicknesses, 2.0 mm; and increments, 2 mm. After unenhanced scanning, approximately 65-75 mL of iohexol (350 mg I/mL, Omnipaque, GE Healthcare) was injected into the antecubital vein at 2.0-2.5 mL/s via a pump injector. CT scans of the AP and PVP were carried out at 25-35 s and 60-70 s after injection, respectively.
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9

Contrast-Enhanced CT Imaging Protocol

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The CT examinations were performed using a Somatom Definition AS+ scanner (Siemens Healthineers, Erlangen, Germany). The CT examinations were obtained with standard exposure parameters (200 effective mAs and 120 kVp; the actual radiation dose was adjusted according to the patient’s body size and shape by automatically modulating the tube current, a detector configuration of 1.5 mm × 16 mm, a table feed of 24 mm per rotation, and a gantry rotation time of 0.5 s. Contrast-enhanced CT scans were performed in the supine position in the portal venous phase with a fixed delay of 70 s after contrast agent injection. By using an autoinjector, 120 mL of nonionic contrast material was intravenously administered at the rate of 3 mL/s. The images were reconstructed with a section thickness and interval of 5 mm.
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10

CT Scan Protocol for Respiratory Artifact Reduction

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The preoperative CT examinations were conducted at deep inspiration to avoid the influence of respiratory artifacts. The scanned images were acquired on a Brilliance 40 scanner (Philips Medical Systems, Netherlands) and a Somatom Definition AS scanner (Siemens Medical Systems, Germany). The CT scan parameters and conditions were as follows: 120 kV, 180–220 mAs, 64 × 0.625 mm or 40 × 0.625 mm detector, 0.4 or 1.0 pitch, 512 × 512 matrix, reconstructed at 1.0 mm thickness with 0.7 mm increment, and a standard soft tissue kernel.
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