X-ray computed tomography: Difference between revisions
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* Spiral CT. Spiral CT, also called helical CT is "computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures".<ref>{{MeSH|Tomography, Spiral Computed}}</ref> Examples include [[computed tomographic pulmonary angiography]] for detecting [[pulmonary embolism]], [[computed tomographic cardiac angiography]] for detecting [[coronary heart disease]]<ref name="pmid18691486">{{cite journal |author=Stein PD, Yaekoub AY, Matta F, Sostman HD |title=64-slice CT for diagnosis of coronary artery disease: a systematic review |journal=The American journal of medicine |volume=121 |issue=8 |pages=715–25 |year=2008 |month=August |pmid=18691486 |doi=10.1016/j.amjmed.2008.02.039 |url=http://linkinghub.elsevier.com/retrieve/pii/S0002-9343(08)00298-2 |issn=}}</ref>, and [[computed tomographic colonography]] (virtual colonoscopy). | * Spiral CT. Spiral CT, also called helical CT is "computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures".<ref>{{MeSH|Tomography, Spiral Computed}}</ref> Examples include [[computed tomographic pulmonary angiography]] for detecting [[pulmonary embolism]], [[computed tomographic cardiac angiography]] for detecting [[coronary heart disease]]<ref name="pmid18691486">{{cite journal |author=Stein PD, Yaekoub AY, Matta F, Sostman HD |title=64-slice CT for diagnosis of coronary artery disease: a systematic review |journal=The American journal of medicine |volume=121 |issue=8 |pages=715–25 |year=2008 |month=August |pmid=18691486 |doi=10.1016/j.amjmed.2008.02.039 |url=http://linkinghub.elsevier.com/retrieve/pii/S0002-9343(08)00298-2 |issn=}}</ref>, and [[computed tomographic colonography]] (virtual colonoscopy). | ||
* Cone CT is uses a cone or pyramid-shaped beam of radiation.<ref>{{MeSH|Cone-Beam Computed Tomography}}</ref> | * Cone CT is uses a cone or pyramid-shaped beam of radiation.<ref>{{MeSH|Cone-Beam Computed Tomography}}</ref> | ||
==Findings== | |||
===Tree-in-bud sign=== | |||
The tree-in-bud sign on CT of the chest "represents bronchiolar luminal impaction with mucus, pus, or fluid, which demarcates the normally invisible branching course of the peripheral airways."<ref name="pmid11867799">{{cite journal| author=Eisenhuber E| title=The tree-in-bud sign. | journal=Radiology | year= 2002 | volume= 222 | issue= 3 | pages= 771-2 | pmid=11867799 | |||
| url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=clinical.uthscsa.edu/cite&retmode=ref&cmd=prlinks&id=11867799 }} </ref><ref name="pmid19933620">{{cite journal| author=Gosset N, Bankier AA, Eisenberg RL| title=Tree-in-bud pattern. | journal=AJR Am J Roentgenol | year= 2009 | volume= 193 | issue= 6 | pages= W472-7 | pmid=19933620 | |||
| url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=clinical.uthscsa.edu/cite&retmode=ref&cmd=prlinks&id=19933620 | doi=10.2214/AJR.09.3401 }} </ref> | |||
==Adverse effects== | ==Adverse effects== | ||
Revision as of 08:26, 27 April 2010
X-ray computerized tomography is a type of computed tomography and is defined as "tomography using x-ray transmission and a computer algorithm to reconstruct the image."[1]
Classification
Newer types of X-ray computerized tomography
- Spiral CT. Spiral CT, also called helical CT is "computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures".[2] Examples include computed tomographic pulmonary angiography for detecting pulmonary embolism, computed tomographic cardiac angiography for detecting coronary heart disease[3], and computed tomographic colonography (virtual colonoscopy).
- Cone CT is uses a cone or pyramid-shaped beam of radiation.[4]
Findings
Tree-in-bud sign
The tree-in-bud sign on CT of the chest "represents bronchiolar luminal impaction with mucus, pus, or fluid, which demarcates the normally invisible branching course of the peripheral airways."[5][6]
Adverse effects
The risk associated with a CT scan (the increased risk of cancer associated with the radiation doses) is extremely low for any one person. However, given the increasing number of CT scans being obtained, the increasing exposure to radiation in the population may be a public health issue in the future. [7]
References
- ↑ Anonymous (2024), X-ray computed tomography (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ Anonymous (2024), Tomography, Spiral Computed (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ Stein PD, Yaekoub AY, Matta F, Sostman HD (August 2008). "64-slice CT for diagnosis of coronary artery disease: a systematic review". The American journal of medicine 121 (8): 715–25. DOI:10.1016/j.amjmed.2008.02.039. PMID 18691486. Research Blogging.
- ↑ Anonymous (2024), Cone-Beam Computed Tomography (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ Eisenhuber E (2002). "The tree-in-bud sign.". Radiology 222 (3): 771-2. PMID 11867799.
- ↑ Gosset N, Bankier AA, Eisenberg RL (2009). "Tree-in-bud pattern.". AJR Am J Roentgenol 193 (6): W472-7. DOI:10.2214/AJR.09.3401. PMID 19933620. Research Blogging.
- ↑ Brenner DJ, Hall EJ (2007). "Computed tomography--an increasing source of radiation exposure". N Engl J Med 357: 2277–84. DOI:10.1056/NEJMra072149. PMID 18046031. Research Blogging.