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High resolution T1 weighted magnetic resonance imaging of the deep brain structures using a reduced bandwidth

¹ Centre Inter-Etablissement de Résonance Magnétique, Bicêtre Hospital, Paris XI University, 94270 Le Kremlin-Bicêtre, France ² Laboratory of Anatomy, Lille II University, Place de Verdun, 59045 Lille Cedex, France ³ Department of Radiology, Institut Gustave Roussy, 94805 Villejuif Cedex, France ⁴ INSERM U 66, Institut Gustave Roussy, 94805 Villejuif Cedex, France ⁵ General Electric Medical Systems Europe, 78530 Buc Cedex, France

High spatial resolution T₁ weighted images of the brain were acquired in 5–13 min on a whole-body magnetic resonance imager operating at 1.5 T. In order to obtain 5–8 cm field of view images, the receiver bandwidth (Bw) was lowered to 2 kHz. The use of a 2 kHz Bw, instead of the standard 16 kHz Bw, partially compensated the signal loss due to the small pixel size by increasing the signal-to-noise ratio, without scan time penalty. The chemical shift artifact associated with reduced Bw was not observed because fat signal is negligible in the brain.

Received for publication February 28, 1994. Revision received September 28, 1994. Accepted for publication October 10, 1994.