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Artifacts in magnetic resonance imaging.

Krupa K, Bekiesińska-Figatowska M - Pol J Radiol (2015)

Bottom Line: An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen.Some proposals of reducing artifacts have been mentioned.Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature.

View Article: PubMed Central - PubMed

Affiliation: Department of Diagnostic Imaging, Institute of Mother and Child, Warsaw, Poland.

ABSTRACT
Artifacts in magnetic resonance imaging and foreign bodies within the patient's body may be confused with a pathology or may reduce the quality of examinations. Radiologists are frequently not informed about the medical history of patients and face postoperative/other images they are not familiar with. A gallery of such images was presented in this manuscript. A truncation artifact in the spinal cord could be misinterpreted as a syrinx. Motion artifacts caused by breathing, cardiac movement, CSF pulsation/blood flow create a ghost artifact which can be reduced by patient immobilization, or cardiac/respiratory gating. Aliasing artifacts can be eliminated by increasing the field of view. An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen. Metallic and other foreign bodies which may be found on and in patients' bodies are the main group of artifacts and these are the focus of this study: e.g. make-up, tattoos, hairbands, clothes, endovascular embolization, prostheses, surgical clips, intraorbital and other medical implants, etc. Knowledge of different types of artifacts and their origin, and of possible foreign bodies is necessary to eliminate them or to reduce their negative influence on MR images by adjusting acquisition parameters. It is also necessary to take them into consideration when interpreting the images. Some proposals of reducing artifacts have been mentioned. Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature.

No MeSH data available.


Related in: MedlinePlus

Aliasing artifact (“wrap around”) on brain MRI with FOV=24×18 cm (A). The same patient, examination with FOV=24×24 cm (B).
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f7-poljradiol-80-93: Aliasing artifact (“wrap around”) on brain MRI with FOV=24×18 cm (A). The same patient, examination with FOV=24×24 cm (B).

Mentions: Aliasing artifacts occur when the anatomical structures located outside the field of view are mapped at the opposite end of the image. One can eliminate them by increasing the field of view (FOV) [3] (Figure 7A, 7B).


Artifacts in magnetic resonance imaging.

Krupa K, Bekiesińska-Figatowska M - Pol J Radiol (2015)

Aliasing artifact (“wrap around”) on brain MRI with FOV=24×18 cm (A). The same patient, examination with FOV=24×24 cm (B).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4340093&req=5

f7-poljradiol-80-93: Aliasing artifact (“wrap around”) on brain MRI with FOV=24×18 cm (A). The same patient, examination with FOV=24×24 cm (B).
Mentions: Aliasing artifacts occur when the anatomical structures located outside the field of view are mapped at the opposite end of the image. One can eliminate them by increasing the field of view (FOV) [3] (Figure 7A, 7B).

Bottom Line: An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen.Some proposals of reducing artifacts have been mentioned.Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature.

View Article: PubMed Central - PubMed

Affiliation: Department of Diagnostic Imaging, Institute of Mother and Child, Warsaw, Poland.

ABSTRACT
Artifacts in magnetic resonance imaging and foreign bodies within the patient's body may be confused with a pathology or may reduce the quality of examinations. Radiologists are frequently not informed about the medical history of patients and face postoperative/other images they are not familiar with. A gallery of such images was presented in this manuscript. A truncation artifact in the spinal cord could be misinterpreted as a syrinx. Motion artifacts caused by breathing, cardiac movement, CSF pulsation/blood flow create a ghost artifact which can be reduced by patient immobilization, or cardiac/respiratory gating. Aliasing artifacts can be eliminated by increasing the field of view. An artificially hyperintense signal on FLAIR images can result from magnetic susceptibility artifacts, CSF/vascular pulsation, motion, but can also be found in patients undergoing MRI examinations while receiving supplemental oxygen. Metallic and other foreign bodies which may be found on and in patients' bodies are the main group of artifacts and these are the focus of this study: e.g. make-up, tattoos, hairbands, clothes, endovascular embolization, prostheses, surgical clips, intraorbital and other medical implants, etc. Knowledge of different types of artifacts and their origin, and of possible foreign bodies is necessary to eliminate them or to reduce their negative influence on MR images by adjusting acquisition parameters. It is also necessary to take them into consideration when interpreting the images. Some proposals of reducing artifacts have been mentioned. Describing in detail the procedures to avoid or limit the artifacts would go beyond the scope of this paper but technical ways to reduce them can be found in the cited literature.

No MeSH data available.


Related in: MedlinePlus