Virtual single-source computed tomography using dual-source acquisition: a new technique for the dose-neutral...

Area of Science:

• Medical Imaging
• Radiology
• Computed Tomography

Background:

• Standard single-source CT (SSS-CT) is a common imaging modality.
• Dual-source CT (DSCT) allows for acquiring data with two X-ray tubes simultaneously.
• Virtual single-source CT (VSS-CT) aims to reconstruct SSS-CT-like datasets from DSCT raw data.

Purpose of the Study:

• To compare image quality between SSS-CT and VSS-CT in abdominal CT.
• To establish a radiation dose-neutral approach for comparing different acquisition protocols.
• To evaluate VSS-CT's potential for intraindividual comparison of radiation dose levels (RDLs).

Main Methods:

• An abdominal phantom was imaged using DSCT at three RDLs (low, standard, high).
• Raw data were acquired in SSS mode and DSCT mode with varying tube current ratios.
• Image quality was assessed using modulation transfer function, image noise, noise power spectrum, and MS-SSIM*.

Main Results:

• VSS-CT demonstrated noninferior modulation transfer function across all RDLs (P < 0.05).
• Image noise showed acceptable increases (<3.2%), with minor noise power spectrum differences.
• MS-SSIM* showed negligible decrease for high RDL VSS-CT (<2%); standard/low RDLs had minor increases.

Conclusions:

• VSS-CT and SSS-CT exhibit negligible differences in image quality at equivalent radiation exposure.
• VSS-CT facilitates intraindividual comparison of full and reduced radiation dose protocols.
• This technique allows dose comparison within a single acquisition by splitting DSCT radiation dose.