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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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The technical development of photon-counting detector CT.

Cynthia H McCollough¹, Kishore Rajendran², Shuai Leng²

¹Department of Radiology, Mayo Clinic, Rochester, MN, USA. mccollough.cynthia@mayo.edu.

European Radiology

|April 4, 2023

Summary

This summary is machine-generated.

Photon-counting detector CT (PCD-CT) represents a significant advancement over traditional energy-integrating detectors (EIDs). PCD-CT offers superior image quality, including better resolution and contrast, with improved dose efficiency and multi-energy capabilities.

Keywords:

Humans Iodine Photons Radiation dosage Tomography, X-ray computed

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Area of Science:

Medical Imaging
Detector Physics
Computed Tomography

Background:

Clinical CT systems have historically used energy-integrating detectors (EIDs) since 1971, employing a two-step X-ray to electronic signal conversion.
Photon-counting detectors (PCDs) offer a one-step, direct X-ray conversion process, enabling energy resolution.

Purpose of the Study:

To provide a technical introduction to photon-counting detector CT (PCD-CT) systems.
To describe the benefits, limitations, and potential improvements of PCD-CT technology.
To summarize imaging benefits reported from preclinical and clinical PCD-CT systems.

Main Methods:

Review of technical principles behind PCD-CT.
Discussion of various PCD-CT implementations from small-animal to clinical scanners.
Summary of reported imaging benefits in preclinical and clinical studies.

Main Results:

PCDs offer improved spatial resolution, contrast-to-noise ratio, and elimination of electronic noise compared to EIDs.
PCD-CT provides enhanced dose efficiency and enables routine multi-energy imaging.
High-resolution, multi-energy imaging with PCD-CT facilitates novel imaging approaches like multi-contrast imaging.

Conclusions:

Photon-counting detector CT is a major technological advance in CT imaging.
PCD-CT significantly outperforms traditional EID-CT in key imaging metrics.
The capabilities of PCD-CT are expanding the possibilities for advanced imaging applications.