Magnetic Resonance Imaging (MRI) Practice Test

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A disadvantage of TOF MRA is high signal in some background tissues. To minimize signal from background tissues, TE should be selected that enables the signals from fat and water to be?

  1. In phase

  2. High intensity

  3. Out of phase

  4. Minimized effectively

The correct answer is: Out of phase

Selecting a time echo (TE) that allows signals from fat and water to be out of phase effectively minimizes the high signal from background tissues in Time-of-Flight Magnetic Resonance Angiography (TOF MRA). This is crucial because fat and water have different resonance frequencies at particular magnetic field strengths, and when their signals are out of phase, they will interfere with each other, canceling out to produce a lower signal intensity. By utilizing a TE where fat and water are out of phase, one can reduce the unwanted high signal that can obscure the vascular structures being examined. This technique helps improve the contrast and visualization of the blood vessels, allowing for clearer imaging during the MRA procedure. High signal intensity or being in phase would increase the visibility of background tissues and detract from the images of interest, while minimizing effectively is a vague expression that does not reference the specific relationship between fat and water signals.