| Two methods for isolating the lung area of a CT scan for density information. | |
| | |
MedLine Citation:
|
PMID: 7089289 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Extracting density information from irregularly shaped tissue areas of CT scans requires automated methods when many scans are involved. We describe two computer methods that automatically isolate the lung area of a CT scan. Each starts from a single, operator specified point in the lung. The first method follows the steep density gradient boundary between lung and adjacent tissues; this tracking method is useful for estimating the overall density and total area of lung in a scan because all pixels within the lung area are available for statistical sampling. The second method finds all contiguous pixels of lung that are within the CT number range of air to water and are not a part of strong density gradient edges; this method is useful for estimating density and area of the lung parenchyma. Structures within the lung area that are surrounded by strong density gradient edges, such as large blood vessels, airways and nodules, are excluded from the lung sample while lung areas with diffuse borders, such as an area of mild or moderate edema, are retained. Both methods were tested on scans from an animal model of pulmonary edema and were found to be effective in isolating normal and diseased lungs. These methods are also suitable for isolating other organ areas of CT scans that are bounded by density gradient edges. |
| | |
Authors:
|
L W Hedlund; R F Anderson; P L Goulding; J W Beck; E L Effmann; C E Putman |
Related Documents
:
|
14743899 - Crackle analysis for chest auscultation and comparison with high-resolution ct findings. 21630549 - Dynamic mr imaging of kidneys perfused with eob-gd-dtpa. 12456999 - Prediction of functional reserves after lung resection: comparison between quantitative... 18306979 - Tacrolimus-induced lung injury in a rheumatoid arthritis patient with interstitial pneu... 2783429 - Stratified impairment of pulmonary ventilation in "diffuse panbronchiolitis:" pet and c... 10524809 - Visual quantitation and observer variation of signs of small airways disease at inspira... 10915669 - Sensitivity of ct scout radiography and abdominal radiography for revealing ureteral ca... 14743899 - Crackle analysis for chest auscultation and comparison with high-resolution ct findings. 2002109 - Measurement of thyroid iodine by ct. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Radiology Volume: 144 ISSN: 0033-8419 ISO Abbreviation: Radiology Publication Date: 1982 Jul |
Date Detail:
|
Created Date: 1982-08-07 Completed Date: 1982-08-07 Revised Date: 2003-11-14 |
Medline Journal Info:
|
Nlm Unique ID: 0401260 Medline TA: Radiology Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 353-7 Citation Subset: AIM; IM |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Densitometry / methods Dogs Edema / radiography* Lung / anatomy & histology, radiography* Lung Diseases / radiography* Models, Biological Technology, Radiologic Tomography, X-Ray Computed* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Distinguishing benign from malignant pulmonary nodules by computed tomography.
Next Document: The interface sign: a computed tomographic sign for distinguishing pleural and intra-abdominal fluid...