A 16-slice spiral CT (Aquillion 16, Toshiba, Japan; or Aquillion 64, Siemens, Germany) scan was used for preoperative CT-guided localization. The following scanning criteria were used: 120 kV, 60 mA, a thickness of 2 mm, a spacing of 2 mm, a pitch of 1.1 seconds, and a rotation time of 0.6 seconds. Patients were told to hold their breath at the end of normal inhalation for scanning.
Aquillion 16
Manufactured by Toshiba
Sourced in Japan
The Aquillion 16 is a medical imaging device manufactured by Toshiba. It is a 16-slice computed tomography (CT) scanner that captures detailed 3D images of the human body. The Aquillion 16 is designed to provide high-quality imaging for a variety of clinical applications.
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3 protocols using aquillion 16
1
Preoperative CT-guided Localization Protocol
2
Abdominal Fat Volume Quantification by CT
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All participants underwent CT scanning in the supine position with both arms raised above the head after urination. A 16‐row multidetector CT unit (Aquillion™ 16; Toshiba Medical Systems Corp., Tokyo, Japan) was used with scanning conditions of 120 kV, 250–300 mA and 0.5‐s rotation. The protocol involved acquisition of 700–800 images with a slice thickness of 0.5 mm at 8‐mm intervals from the top of liver to the floor of the pelvic cavity. Adipose tissue was identified as the pixels ranging from –190 to –30 Hounsfield units, as reported previously22 . All imaging data were transferred to a PC workstation for analysis of the total abdominal fat volume. Visceral fat volume and the subcutaneous abdominal fat volume (SFV) were calculated with SYNAPSE VINCENT® software (Fuji Film, Tokyo, Japan). VFA was calculated at the mid‐umbilical level. To prevent an interobserver variation, assessment of adipose tissue was carried out by the same examiner.
3
Standardized Liver Metastases CT Scanning
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All CT scans included an arterial phase scan and a portal venous phase scan, using slices of 5 mm or less for reconstructive images. Contrast-enhance CT scans obtained in the LUMC were performed on a 16-slice spiral CT (Aquillion-16, Toshiba, Tokyo, Japan) using the following scanning parameters: 16 × 1 mm scanning, 120 KV, rotation 0.5 s, contrast Ultravist 370 (dose weight depended: for a standard patient (75 kg) 120 ml was injected. Based on weight categories 46–60 kg, 60–80 kg, 80–100 kg, 100+ kg 20% more or less of the dose was administered) with a delay of 75 s for portal venous phase. Further parameters of CT scanning: the current modulation for the tube varying is from 10 to 500 mA. The pitch factor is 0.8125. Noise index with standard deviation of 10 is used. An Adaptive Iterative Dose Reduction (AIDR) 3D is used as reconstruction algorithm. The reconstruction kernel is FC 18 (soft tissue filter). The CT scans were scored for the presence, the number, location and size of all liver metastases. All scans were evaluated by one of four radiologists from the LUMC, all with at least 5 years of experience in liver imaging.
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