Low dose CT denoising

Abstract

A system includes a source that rotates about an examination region and emits radiation that traverses the examination region, a radiation sensitive detector array that detects radiation traversing the examination region and generates projection data indicative of the detected radiation, and a projection data de-noiser that de-noises the projection data, wherein the de-noiser de-noises a projection based on a number of detected photons for the projection.

Description

technical field [0001] The following generally relates to noise reduction of data, which is particularly applicable to computed tomography (CT), but is equally applicable to other imaging modalities, for example, hybrid PET / CT systems, digital X-ray systems, and / or other imaging modalities . Background technique [0002] A multi-slice computed tomography (CT) scanner includes an x-ray tube mounted on a rotatable gantry that rotates about a longitudinal or z-axis around an examination region. The X-ray tube emits radiation across the examination region and the subject or object within it. The two-dimensional detector array defines an angled arc opposite the X-ray tube across the examination region. The detector array includes a plurality of rows of detectors aligned relative to each other and extending along the z-axis. The detectors detect radiation traversing the examination region and a subject or object within it and generate projection data indicative thereof. A reco...

AI Technical Summary

Problems solved by technology

However, ML-based reconstruction is extremely computationally expensive, which currently hinders its application in routine practice

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