Title of article :
Image feature based automatic correction of low-frequency spatial intensity variations in MR images
Author/Authors :
Koivula، نويسنده , , Antero and Alakuijala، نويسنده , , Jyrki and Tervonen، نويسنده , , Osmo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1997
Abstract :
An automatic method of compensating for low-frequency variations in magnetic resonance images is presented. Small variations within a tissue type are modelled and a correction function is generated. The methods is based completely on image features and does not need a phantom or user interaction to generate the compensation function. This image correction simplifies digital image analysis and may enhance clinical evaluation. As a result, the correction technique reduces inhomogeneity and improves contrast. Our results show that the radiofrequency response variation of coils can be reduced. The segmentation process, even with a simple threshold method, produces more reliable results when corrected images are used. The presented method is most useful for images acquired in the sagital and coronal planes with circular local coils, or using surface coils, e.g., spine coils.
Keywords :
MRI , MAGNETIC RESONANCE IMAGING , Image intensity correction , nonuniformity
Journal title :
Magnetic Resonance Imaging
Journal title :
Magnetic Resonance Imaging