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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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Related Experiment Video

Updated: Jun 25, 2025

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

Published on: May 17, 2018

[Effects of Subject Position on Metal Artifact Reduction of a Reverse Shoulder Prosthesis Using Computed Tomography].

Tetsuya Ijichi¹, Nariaki Tabata¹, Yuna Kawahara¹

¹Department of Radiology, Fukuoka University Chikushi Hospital.

Nihon Hoshasen Gijutsu Gakkai Zasshi

|May 22, 2024

Summary

Single energy metal artifact reduction (SEMAR) effectively reduces artifacts from reverse shoulder prostheses. However, artifact reduction may decrease as the subject moves off the CT scanner's center.

Keywords:

computed tomography (CT)metal artifact reverse shoulder prosthesis single energy metal artifact reduction (SEMAR)subject position

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Area of Science:

Medical Imaging
Radiology
Biomedical Engineering

Context:

Computed tomography (CT) is crucial for imaging orthopedic implants.
Metal artifacts can obscure details of prostheses, impacting diagnosis.
Single energy metal artifact reduction (SEMAR) is a software-based technique to mitigate these artifacts.

Purpose:

To evaluate the impact of patient positioning on SEMAR effectiveness for reverse shoulder prostheses.
To quantify artifact reduction across different positions using CT.

Summary:

A water phantom with a reverse shoulder prosthesis was scanned at varying positions (0-150 mm off-center).
Images were acquired with and without SEMAR, and artifact levels were assessed physically (artifact index) and visually.
SEMAR significantly reduced metal artifacts, but artifact levels increased as the phantom moved further from the scanner's center.

Impact:

SEMAR is a valuable tool for reducing metal artifacts in reverse shoulder prosthesis imaging.
Optimal patient positioning (on-center) is crucial for maximizing SEMAR's benefits.
Findings can inform imaging protocols to improve diagnostic accuracy for patients with these implants.