Current CT scanners can very accurately diagnose CAD requiring revascularisation in most patients. However, imaging technologies have developed rapidly and new-generation computed tomography (NGCCT) scanners may benefit patients who are difficult to image (e.g. obese patients, patients with high or irregular heart beats and patients who have All the patients were scanned on a 128-slice dual-source Siemens Definition Flash scanner (Siemens Healthcare). Images were acquired in a high-pitch helical mode, with a pitch of 3.0, gantry rotation time of 0.28 seconds, and collimation of 64 × 2 × 0.6 mm. Scanning parameters were dependent on BMI, with kVp of 80 to 120 and mAs of 130–150 An MRI scan is required when images need to be detailed. An MRI scan offers more soft tissue image and bone details than a CT scan. Especially in the case of strokes, tumours, etc. MRI scans show the difference between normal and abnormal tissue. A CT scan is used when speed is important: for example, in the case of trauma and stroke. Helical CT scanning is described by defining the pitch ratio, which is the ratio of the distance moved by the table (patient) in one rotation of the x-ray tube divided by the nominal x-ray beam width. A helical scan performed using a pitch ratio of 1 corresponds most closely to contiguous axial scanning. Pitch ratios that are less than 1, as is
Clinical Images. SCENARIA is Hitachi's 128 slice CT scanner which paves the way for the future. The whole body scanner with a 0.35-second rotation speed which reduces kinetic artefact, examination time and contrast volume for vascular exploration dosage, while maintaining excellent diagnostic imagery.

3. Go to the image at scan location S80 in the Series 1, Helical scans. 4. Select Measure in the tools and select a circular ROI. Increase the size of the ROI to about 1000 mm2, keeping it circular and in the center of the phantom image. 5. Record both the Mean CT Number and the standard deviation from the ROI into the QA data sheet. the

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    • 128 slice ct scan meaning