Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1996-10-30
1998-10-27
Smith, Ruth S.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600420, 324306, 324309, A61B 5055
Patent
active
058271872
ABSTRACT:
A dynamic MR angiography technique, MR digital subtraction angiography (MR DSA), based on fast acquisition, contrast enhancement and complex subtraction is described. When a bolus of contrast is injected into a patient, data acquisition begins, dynamically acquiring a thick slab using a fast gradient echo sequence for 1060 sec. Similar to x-ray DSA, a mask is selected from the images without contrast enhancement, and later images are subtracted from the mask to generate angiograms. Complex subtraction is used to overcome the partial volume effects related to the phase difference between the flowing and stationary magnetization in a voxel.
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Ehman Richard L.
Wang Yi
Mayo Foundation for Medical Education and Research
Smith Ruth S.
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