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Updated: Jun 2, 2026

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm

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Protocol Optimization for Functional Cardiac CT Imaging Using Noise Emulation in the Raw Data Domain.

Zhye Yin¹, Pengwei Wu², Ashish Manohar³

¹GE HealthCare, Waukesha, WI, USA.

|April 1, 2024

Summary

This summary is machine-generated.

A new noise emulation method creates accurate low-dose four-dimensional (4D) cardiac CT scans from high-dose data. This technique optimizes protocols for reduced radiation exposure while maintaining image quality for cardiac function analysis.

Keywords:

Functional Cardiac CT Image Quality Low-Dose Emulation Noise Injection

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Area of Science:

Medical Imaging
Radiological Physics

Background:

Four-dimensional (4D) computed tomography (CT) is vital for assessing cardiac mechanical function.
Repeated CT scans for comprehensive analysis raise radiation dose concerns.

Approach:

Developed a projection-domain noise emulation method to generate low-dose 4D cardiac CT from high-dose scans.
Incorporated quantum and electronic noise, channel-dependent detector gain, and a novel image quality metric for accurate dose reduction.
Validated the method using phantom and clinical data, assessing visual similarity, CNR, and NPS.

Key Points:

Emulated low-dose images closely matched real low-dose scans in noise, artifacts, and texture.
Channel-dependent detector gain improved emulation accuracy.
Proposed image quality metric guided selection of optimal kVp and mA settings for patient-specific low-dose protocols.

Conclusions:

The described method accurately emulates noise, artifacts, and texture in low-dose 4D cardiac CT.
This framework enables prospective selection of patient-specific, minimal-dose protocols for functional cardiac CT.