Keywords:
CT, Pelvis, Extremities, Abdomen, Comparative studies, Artifacts
Authors:
T. Fujioka1, T. Osonoi1, K. Fukuda1, H. Osakabe2, D. Suzuki1, A. Koizumi1, M. Igarashi1, F. Nakagawa1; 1Minatoku, Tokyo/JP, 2Tokyo/JP
DOI:
10.1594/ecr2013/C-1222
Purpose
Introduction
In the last 4 decades X-ray computed tomography (CT) has continually matured,
and it now constitutes a powerful tool in medical diagnostics.
As a non-invasive imaging technique,
the use of CT has become essential,
especially since the advent of Multi Detector-law CT (MDCT) in the 2000s,
which led to shorter scan times and improved 3D spatial resolution.
However,
the quality of images generated with a CT scanner can still be deteriorated by the presence of metal objects in the field of view.
Images of patients with metal implants such as hip prostheses suffer from artifacts,
generally in the form of bright and dark streaks,
cupping and capping; these artifacts are mostly due to quantum noise,
scattered radiation and beam hardening [1].
Metal artifacts influence image quality by reducing contrast and by obscuring details,
thus impairing the detectability of structures of interest; in the worst case,
this can make a diagnosis impossible.
Artifact-free images with metal cannot be obtained using filtered back projection (FBP).
Metal Artifact Reduction for Orthopedic Implants Algorithm (O-MAR,
PHILIPS Healthcare) be able to reduce adverse affects of metal objects.
Purpose
The purpose of research is to find low contrasts,
which can be detected by CT scan with O-MAR in a phantom study.