Lightspeed vct 64 slice ct scanner

A total of 26 patients who had received contrast-enhanced CT-based coronary angiography with retrospective electrocardiographic gating had been randomly selected in a previous study [7] . The use of these data for the current study was approved by the Institutional Review Board at The University of Texas MD Anderson Cancer Center (PA12-0340), including a specific waiver to obtain written consent from the patient for this retrospective data review study. The images were taken using a GE LightSpeed VCT 64-slice CT scanner (GE Healthcare, Waukesha, WI) and deep-inspiration breath hold with patients' arms raised above their shoulders, in a position similar to that used for radiation therapy. For each patient, 10 CT data sets were reconstructed over a cardiac cycle from the carina to the bottom of the heart. These images had 1.25-mm slice thickness and 0.35×0.35 mm² pixel size. The images corresponding to the diastolic phases of cardiac motion were imported into a Pinnacle³ treatment planning system (Philips Medical Systems, Fitchburg, WI), and the esophagus was delineated on a single, consistent phase using standard delineation tools.

A Lightspeed VCT 64-slice CT scanner (GE Healthcare, Boston, US) was used. The scan range was from the top of the liver to a section 2 cm lower than the inferior border of the liver. A contrast agent containing 1%–2% iodine was orally administered before the examination. The slice thickness was 5 mm without reconstruction intervals. A plain CT scan was performed first, and then a bolus injection of 80–100 ml of iopromide (a contrast agent containing 300 mg/ml of iodine) was administered via the cubital vein using a high-pressure syringe at 3.5 ml/s. Triphasic, dynamic CT was performed. The hepatic arterial phase (HAP), portal venous phase (PVP), and delayed phase were 20–25 s, 60 s, and 90–120 s, respectively, after the start of the injection.

Patients were followed up every three months after the completion of radiation treatment. They received medical consultation and underwent chest CT scans every three months within two years and then every six months thereafter. Lung imaging was performed using a LightSpeed VCT 64-slice CT scanner (GE Healthcare, Waukesha, WI) at a slice thickness of 5 mm. The parameters for CT acquisition were as follows: helical pitch, 1.375:1; beam collimation, 20 mm; and reconstruction, 5 mm. When recurrence was suspected, an immediate follow-up CT or PET-CT was performed. The final judgement regarding recurrence was made during the cancer board held every week. The severity of RILI was assessed according to the Common Terminology Criteria for Adverse Events (CTCAE), ver.4.0.

Patients were followed up every three months after the completion of radiation treatment. They received medical consultation and underwent chest CT scans every three months within two years and then every six months thereafter. Lung imaging was performed using a LightSpeed VCT 64-slice CT scanner (GE Healthcare, Waukesha, WI) at a slice thickness of 5 mm. The parameters for CT acquisition were as follows: helical pitch, 1.375:1; beam collimation, 20 mm; and reconstruction, 5 mm. When recurrence was suspected, an immediate follow-up CT or PET-CT was performed. The final judgement regarding recurrence was made during the cancer board held every week. The severity of RILI was assessed according to the Common Terminology Criteria for Adverse Events (CTCAE), ver.4.0.

All patients underwent a CTP test (GE LightSpeed VCT 64 Slice CT Scanner) to determine cerebral perfusion status and not all patients were reviewed for CTP after surgery because of radiation hazards. However, once adverse reaction occurred in patients similar to HPS postoperatively, we would actively review CTP test to determine whether HPS was present. A head retainer was used to keep the patient’s head as stationary as possible during the scan. Ioformol (Hengrui Co. Ltd., China) was administered via the median cubital vein at a flow rate of 5.0 mL/s at a dose of 50 mL. The scan parameters were as follows: tube voltage = 80 kV, tube current = 120–150 mA, layer thickness = 1.25 mm, total scanning time = 60 s; the plateau, inflow, and outflow period were all included. Data were automatically analyzed using brain perfusion CT image processing software (PerfusionGo V1.0; Shukun, Co. Ltd., China) via a singular value decomposition and deconvolution algorithm for dispersion correction (Figure 2).