Aquilion one ct scanner

Thirty-nine CT scans (32 male, 7 female; mean age: 59.5 ± 18.6 years) of intact lower limbs (distal femur and full tibia), acquired during the clinical assessment of lower limb pathologies unrelated to fracture, were reconstructed to generate 3D surface models. Images (2.0 mm slice thickness) were acquired using a Canon Aquilion ONE CT scanner (Canon Medical Systems, Sydney, Australia). Three-dimensional surface models of the tibia and distal femur were segmented using a threshold-based approach in ScanIP (Simpleware, Exeter, UK). A discrete Gaussian filter with 0.5 mm radius was applied to smooth the reconstructed 3D model. The study received ethics approval from all required institutional Human Research Ethics Committees (Royal Adelaide Hospital Protocol No. 150326, University of South Australia Protocol No. 34385).

Next, we measured the CT numbers of the five mouthpiece materials. To adapt the effect of beam hardening on CT imaging of actual head and neck cancer cases, CT imaging was performed in a water-filled cylindrical container with an outer diameter of 20 cm (inner diameter, 18 cm). All CT images were obtained using an Aquilion ONE CT scanner (Canon Medical Systems Corporation, Otawara, Japan). CT imaging parameters were matched to those usually used for head and neck planning (tube voltage, 120 kV; tube current, 50 mA; field of view, 500 mm; reconstruction kernels; and adaptive iterative dose reduction three-dimensional with a single-energy metal artifact reduction algorithm).
The CT images were imported to the RT planning support software (MIM software™ ver 6.8.4; MIM Software Inc., Cleveland, OH, USA), and the mouthpiece material in the CT image was contoured as the region of interest (ROI). The CT number of the material was determined as the average CT number in the ROI. The error in CT numbers was calculated from the standard deviation of the CT numbers in the mouthpiece.

Clinical and NCCT data were collected retrospectively. The clinical information encompassed the patient’s gender, age, smoking and alcohol history, as well as their history of HTN and DM. The modified Rankin Scale (mRS) was utilized to assess the prognosis of patients with SAH. Additionally, mRS regarding the follow-up evaluations conducted after a three-month period was collected. Based on the results of mRS, patients were divided into two groups: the good outcome group (mRS 0–2) and the poor outcome group (mRS 3–6). NCCT scans were performed using the Aquilion ONE CT scanner (Canon Medical Systems, Otawara, Japan) with a detector row of 320 × 0.5 mm. The scanning parameters included 135 kV, 300 mAs, and reconstruction with adaptive iterative dose reduction. The reconstructed slice thickness was 5 mm.