Cone beam effect
Citation, DOI, disclosures and article data
At the time the article was created Annika Cruickshank had no recorded disclosures.
View Annika Cruickshank's current disclosuresAt the time the article was last revised Andrew Murphy had no financial relationships to ineligible companies to disclose.
View Andrew Murphy's current disclosures- cone beam artifact
Cone beam effect artifacts are seen in multidetector row CT (cone beam CT) acquisitions 1. Modern CT scanners use more detector arrays to increase the number of sections acquired per rotation. This causes the x-ray beams to become cone-shaped as opposed to fan-shaped 2. As a result instead of collecting data that corresponds to a flat plane, each detector collects data that corresponds to the volume contained between two cones 2 which can lead to under-sampling in the cone angle dimension 3. This causes noise, streaks and stair-step artifacts 1. The artifacts are more pronounced at the periphery of the field of view and worsen with an increasing number of detector rows 1.
The problems of cone beam effects have been addressed by the use of cone beam reconstruction techniques instead of standard reconstruction 2. The artifact is also minimized by ensuring a well-sampled environment 3.
References
- 1. F Edward Boas, Dominik Fleischmann. CT artifacts: causes and reduction techniques. (2012) Imaging in Medicine. 4 (2): 229.
- 2. Julia F. Barrett, Nicholas Keat. Artifacts in CT: Recognition and Avoidance1. (2004) RadioGraphics. 24 (6): 1679-91. doi:10.1148/rg.246045065 - Pubmed
- 3. Jerrold T. Bushberg, John M. Boone. The Essential Physics of Medical Imaging. (2011) ISBN: 9780781780575
Incoming Links
Related articles: Computed tomography
- computed tomography in practice
-
computed tomography overview
- iodinated contrast media
- CT IV contrast media administration
-
CT artifacts
- patient-based artifacts
- physics-based artifacts
- hardware-based artifacts
- ring artifact
- tube arcing
- out of field artifact
- air bubble artifact
- helical and multichannel artifacts
- CT technology
-
generations of CT scanners
- helical CT scanning
- step and shoot scanning
- ultra-high-resolution CT (UHRCT)
- CT x-ray tube
- CT fluoroscopy
- cone-beam CT
-
generations of CT scanners
- dual-energy CT
- CT image reconstruction
- CT image quality
- CT dose
-
CT protocols
- composite
- head & neck
- chest
- abdomen and pelvis
- CT abdomen-pelvis (protocol)
- CT abdominal aorta
- CT adrenals (protocol)
- CT cholangiography (protocol)
- CT colonography (protocol)
- CT enteroclysis (protocol)
- CT enterography (protocol)
- CT gastrography (protocol)
- CT kidneys, ureters and bladder (protocol)
- CT urography (protocol)
- CT Renal mass (protocol)
- CT angiography of the splanchnic vessels (protocol)
- CT renal split bolus
- CT pancreas (protocol)
- liver
Unable to process the form. Check for errors and try again.