MDCT was performed within 1 month prior to the RFCA and 3 months after RFCA [13] (link). A 256-slice MDCT scanner (Brilliance iCT; Philips Medical Systems, Cleveland, OH) was used with the following parameters: collimation, 128 mm × 0.625 mm; gantry rotation time, 270 ms; effective tube current, 320–840 mA (with higher values in obese patients); and tube voltage, 120 kV. The iterative reconstruction technique (iDose4 level6; Philips Medical Systems) was utilized to reduce image noise. The scanning technique was determined by the attending physician in charge. A bolus of nonionic iodinated contrast (Iopamirone 370, 1 mL/kg; Bayer, Osaka, Japan) was injected according to the bolus-tracking method (6 s after the threshold of 100 Hounsfield units in the LA). Cardiac images were acquired 20-mm above the bifurcation of the pulmonary artery to the apex of the heart during a single breath-hold. Using the Comprehensive Cardiac Analysis software on the Extended Brilliance Workspace (version 4.5.5.5; 1035 Philips Medical Systems), LAVmax and LAVmin were measured over one cardiac cycle using a volumetric segmentation method, with contour detection visually checked and manually corrected if necessary.
Idose4 level6
Manufactured by Philips
The IDose4 level6 is a piece of laboratory equipment manufactured by Philips. It is designed to perform specific functions within a laboratory setting. The core function of this product is to provide accurate and reliable measurements, but further details on its intended use are not available in this unbiased and factual description.
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Lab products found in correlation
2 protocols using idose4 level6
1
Cardiac Imaging Protocol for Left Atrial Volume
2
Low-Dose CT Acquisition Parameters
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All LDCT and standard-dose CT scans were performed on a 256-slice multi-detector CT scanner (Brilliance iCT, Philips Healthcare, Amsterdam, Netherlands), using the following acquisition parameters: tube voltage of 100 kV and tube current of 20 or 30 mAs for LDCT, tube voltage of 120 kV and tube current of 100 to 250 mAs for standard-dose CT, standard resolution mode, detector collimation of 128 × 0.625 mm, helical pitch of 0.915, and gantry rotation time of 0.4 s. All the raw datasets were then reconstructed using the hybrid iterative reconstruction method (iDose4, level 6, Philips Healthcare, Amsterdam, Netherlands) with standard reconstruction filter for body, slice thickness of 0.625 mm, slice increment of 0.625 mm, field of view of 350 mm × 350 mm, and matrix of 1,024 × 1,024. The estimated effective dose of LDCT scan for all subjects was 0.68 ± 0.11 mSv (range from 0.40 to 0.93).
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