CT value is the attenuation value of X-ray after the absorption of the tissue it passed.13 CT value is usually used to measure the density of an organ or local tissue in the body. Before the operation, abdominal helical enhancement scanning was performed in patients by a 64-slice dual-source CT (Siemens, Germany), and the thickness is 5 mm. The pancreatic CT value was measured by a medical imaging doctor who did not know our research or patient information. Measurement: on the CT image, a region to be measured was obtained on the left side of where the superior mesenteric artery crosses over of the pancreas; then, the CT value of this area was identified automatically by computer. An average value was calculated based on the data of three levels before and after repeated measurement, which was taken as the final CT value.
64 slice dual source ct
Manufactured by Siemens
Sourced in Germany
The 64-slice dual-source CT is a medical imaging device that uses advanced computed tomography (CT) technology to capture high-resolution images of the body. It features two X-ray sources and two corresponding detectors, allowing for faster image acquisition and improved image quality. The core function of this equipment is to provide detailed cross-sectional images of the body's internal structures, which can aid in the diagnosis and treatment of various medical conditions.
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4 protocols using 64 slice dual source ct
1
Measuring Pancreatic Density via CT Scans
2
Dynamic Perfusion Imaging of Tumors
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CTPI was performed by using a 64-slice dual-source CT (Siemens Medical Systems®, Erlangen, Germany). The scan region of the tumor was based on the CT scan of the abdomen (120 kV, 180 mA) obtained without contrast medium during a breath hold at the end of expiration. The scanned region with CTPI consisted of 4 adjacent 6 mm thick sections. For lesions larger than 24 mm in diameter, the levels with the largest tumor diameter were selected. A dynamic study of the selected area was performed in a single breath hold at the end of expiration with the administration of 50 ml non-ionic contrast agent (Visipaque 320®, GE Healthcare) at a rate of 6 ml/s via a power injector by using a bolus tracking algorithm through an 18-gauge intravenous cubital cannula. CTPI scanning (100 mA, 80 kV, section thickness of 6 mm, rotation time 1 second, matrix 512 × 512 mm) was initiated 6 seconds after the injection start, and 4 contiguous sections of tissue were scanned every second for 55 seconds. The contrast agent administration was followed by a power injection of 20 ml of saline (at the same injection rate).
3
3D CT Bronchography and Angiography for Lung Nodules
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Patients in our department routinely received contrast-enhanced computed tomography test (Siemens 64-slice dual-source CT) before surgery and most CT images with solid pulmonary nodules (SPNs), and all of the images with ground-glass nodules (GGNs) would be constructed by Deepinsight platform (Neusoft Group Ltd.) into three-dimensional computed tomography bronchography and angiography(3-DCTAB). Our study collected the 3-DCTBA data of left upper lobe (LUL)from patients who underwent pulmonary surgery from January 2018 to December 2019. The 3D models containing bronchi and pulmonary vessels in each case, sometimes combining with the primitive CT images, were repeatedly inspected and sorted according to different classification standards by 2 thoracic surgeons. This study was approved by the ethics committee of the Jiangsu Province People's Hospital, and informed consent was obtained from each patient.
4
Preoperative Chest-Enhanced CT Protocol
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We performed preoperative chest-enhanced CT using Siemens 64-slice dual-source CT (Somatom Definition) with the contrast agent ioversol 350. A total of 70 ml of contrast medium (ioversol 350) was administered intravenously at a rate of 2–3 ml/s. Contrast-enhanced CT was performed using the fixed-time method. The arterial phase scans were taken 30 s after contrast injection, and the venous phase scans 90 s after contrast injection. The technical parameters used for the Siemens 64-slice dual-source CT were as follows: a collimator thickness of 0.6 mm, a reconstruction layer of 1.25 mm, and an interlayer space of 1 mm (9 (link)). By setting a scan start time, the CT values of the pulmonary veins and arteries revealed density variations in the images. The patients were required to hold their breath throughout the CT scan for appropriate bronchial inflation, and precautions were taken to avoid any potential side effects from the contrast agent following the scan. The volume data from both arterial and venous phases were imported into reconstruction software (Infer Operate Thorax Planning), which computed and processed the data before presenting them in 3D-CTBA images (9 (link)).
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