Central point artifact
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The central point artifact is a focal dot of increased signal in the centercentre of an image. It is caused by a constant offset of the DC voltage in the receiver. After Fourier transformation, this constant offset gives the bright dot in the centercentre of the image as shown in the diagram.
The axial MRI image of the head shows a central point artifact projecting in the pons in the centercentre of the image.
Correction and prevention
- repeating the sequence may get rid of the artifact.
- maintain a constant temperature in scanner and
equipment roomequipment room for receiver amplifiers. - software to estimate DC offset and adjust the data in k-space.
- call service engineer for recalibration
-<p>The <strong>central point artifact</strong> is a focal dot of increased signal in the center of an image. It is caused by a constant offset of the DC voltage in the receiver. After Fourier transformation, this constant offset gives the bright dot in the center of the image as shown in the diagram.</p><p>The axial MRI image of the head shows a central point artifact projecting in the pons in the center of the image.</p><h5>Correction and prevention</h5><ul>- +<p>The <strong>central point artifact</strong> is a focal dot of increased signal in the centre of an image. It is caused by a constant offset of the DC voltage in the receiver. After Fourier transformation, this constant offset gives the bright dot in the centre of the image as shown in the diagram.</p><p>The axial MRI image of the head shows a central point artifact projecting in the pons in the centre of the image.</p><h5>Correction and prevention</h5><ul>
-<li>maintain constant temperature in scanner and equipment room for receiver amplifiers.</li>- +<li>maintain a constant temperature in scanner and equipment room for receiver amplifiers.</li>