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April 1987

Magnetic Resonance Imaging in Patients With Intractable Focal Seizures-Reply

Author Affiliations

The Johns Hopkins University School of Medicine 600 N Wolfe St Baltimore, MD 21205
Department of Radiology The Cleveland Clinic Foundation 9500 Euclid Ave Cleveland, OH 44106

Arch Neurol. 1987;44(4):361. doi:10.1001/archneur.1987.00520160005003

In Reply.  —We thank Dr Wiener for his comments regarding our article. He is correct in surmizing that two, rather than four, data acquisitions were utilized during the 120-ms TE and 2-s TR sequence on the 1.5-tesla unit; four data acquisitions are used on the 0.6-tesla unit. We regret the lack of clarity regarding this point. As he assumed, the third scan sequence was the result of software limitations at the time of the study, limitations no longer present. Finally, as noted above, only two signal acquisitions were utilized on the 1.5-tesla unit. We have found that we must use approximately twice as many data acquisitions on the 0.6-tesla unit in order to achieve a comparable signal-to-noise ratio. Measurements made at The Cleveland Clinic and elsewhere1-3 indicate that the contrast-to-noise ratio increases linearly with increasing field strength.

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