Type of artefact | Artefact appearance | Methods to rectify |
---|---|---|
Air trapping | In recombined images, it appears as black lines. | It can be reduced by applying adequate compression between the skin and the detector or compression paddle. |
Antiperspirants | In LE images, they appear as small white dots, while in recombined images, they appear as black dots. | Ask the patient to clean the breast and axillary region before the examination. |
Breast implant artefact | In recombined images, breast implants produce significant artefacts which compromise the CEDM image quality. | MRI is the preferred imaging modality for patents with breast implants. |
Contrast splatter | Contrast splatter appears as white dots in recombined images. | The staff who administers the contrast should not position the patient in the mammography unit, disconnect the injector tubing away from the mammography unit, clean the detector between patients. |
Ghosting artefact | In recombined images, a latent image from a prior exposure is superimposed on a newly acquired image. | Recalibration of the machine can rectify this artefact. |
Hair artefacts | Hair within the image are visible as thin curvilinear non-enhancing opacities. | Ensure the patient’s hair is pulled back and tied. Remove any earrings or accessories before the examination. |
Halo artefact | This artefact is characterised by a curvilinear area of increased density along the edge within the recombined image. It can mask a lesion. | This artefact is not seen in the newer systems. |
Misregistration artefacts | In recombined images, alternating bright and dark lines, illustrating a “zebra artefact” are seen on surgical clips. | This artefact can be decreased by reducing patient’s motion during image acquisition. |
Motion artefacts | Lesions and post-biopsy markers are poorly defined. | It is reduced by adequate compression and instruct the patient to remain still. |
Negative contrast enhancement | In recombined images, cysts and calcifications appear darker than the surrounding background. | This is not a true artefact and it cannot be eliminated. However, it does not compromise the image quality. |
Post biopsy markers | In recombined images, markers usually appear as high attenuation structures while some are surrounded by a dark halo. | Manufacturers are developing algorithms to reduce these artefacts. |
Ripple artefact | This artefact is characterised by thin black and white parallel lines. | Reducing patient anxiety might reduce this artefact. |
Skin-line enhancement | In recombined images, the skin is seen as a thin rim enhancement also known as a skyline artefact. | This artefact cannot be eliminated. To verify that it is not due to a pathological thickening of the skin, check the skin thickness in LE images. |
The enhancement of skin lesions | Skin angiomas may show enhancement in recombined images. | Careful clinical assessment of the skin. |
Transient retention of contrast in blood vessels | In recombined images, there is a bolus of contrast seen in the blood vessels. | It is a temporary phenomenon that disappears in the subsequent acquisitions. |