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April 1987

Magnetic Resonance Imaging in Patients With Intractable Focal Seizures

Author Affiliations

Mallinckrodt Institute of Radiology St Louis, MO 63110

Arch Neurol. 1987;44(4):361. doi:10.1001/archneur.1987.00520160005002

To the Editor.  —The article by Lesser et al1 in the April 1986 issue lends further support to magnetic resonance imaging's superior sensitivity to computed tomography in detecting intracranial disease. The article also points out the lack of specificity of magnetic resonance imaging signal intensities (a similar problem exists in computed tomography).There are, however, several inconsistencies that should be pointed out. First, the authors state in their "Patients and Methods" section that "The second pulse sequence was a 120-ms TE and a 2-s TR, with four averages and an examination time of nine minutes." Assuming a 128 X 256 acquisition matrix (the standard for their manufacturer, Technicare Corp), the scan time for a 2-s TR and four acquisitions (not averages; four averages implies five or more acquisitions) would be 17 minutes (128 X 2s X 4). Therefore, they must have either used only two signal acquisitions, used only

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