| Nonstationary noise characteristics of the helical scan and its impact on image quality and artifacts. | |
| | |
MedLine Citation:
|
PMID: 9304565 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Helical computed tomography has replaced the conventional step-and-shoot CT in many clinical applications. Because of its clinical importance, a number of comparative studies have been performed to evaluate its performance parameters, such as the noise and the slice sensitivity profile. In this paper, the nonstationary noise characteristics of helical images are carefully examined. Their impact on the low contrast detectability and three-dimensional (3-D) image artifacts is assessed. An analytical equation is derived to relate the interactions between various helical reconstruction schemes and the fan-beam filtered backprojection algorithm. We demonstrate that for many popular helical weights, the noise variation within the field of view of the reconstruction is close to a factor of 3. Several approaches to overcome the undesired characteristics are proposed. |
| | |
Authors:
|
J Hsieh |
Related Documents
:
|
10852655 - Helical ct imaging of gastric cancer: normal wall appearance and the potential for stag... 11555005 - Intravenous digital subtraction angiography and helical computed tomography in evaluati... 16413725 - Helical ct in the diagnosis of acute lower gastrointestinal haemorrhage. 21771935 - Emerging specialty areas in mr imaging: an initial study. 21386265 - The effect of non-magnetic dilution of the tb sublattice in tbco(3)b(2). 20349185 - 18f-fdg pet/ct for monitoring induction chemotherapy in patients with primary inoperabl... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Medical physics Volume: 24 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 1997 Sep |
Date Detail:
|
Created Date: 1997-11-24 Completed Date: 1997-11-24 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 0425746 Medline TA: Med Phys Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 1375-84 Citation Subset: IM |
Affiliation:
|
Applied Science Laboratory, G.E. Medical Systems, Milwaukee, Wisconsin 53201, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Algorithms Biophysical Phenomena Biophysics Computer Simulation Humans Radiographic Image Interpretation, Computer-Assisted Tomography, X-Ray Computed / methods*, statistics & numerical data |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The General Practice Morbidity Database Project Wales--a methodology for primary care data extractio...
Next Document: Real and simulated clustered microcalcifications in digital mammograms. ROC study of observer perfor...