Abstract #2930
On the influence of scanner vibrations on ADC in apparent exchange rate measurements
Julian Emmerich 1 , Lars Mller 1 , Andreas Wetscherek 1 , and Frederik Bernd Laun 1
1
Medical Physics in Radiology, German Cancer
Research Center (DKFZ), Heidelberg, Germany
Due to the strong gradients used for diffusion
weighting, vibrations still play an important role in
measuring the apparent diffusion coefficient (ADC). The
effect of vibrations on ADC measurements was
investigated in an apparent exchange rate measurement
with two diffusion weightings. A wooden frame was built
that enables us to place the phantoms (suspensions of
yeast in water) inside the scanner without direct
physical contact. The standard deviation over six
gradient directions is approximately reduced by a factor
one half, while the ADC, calculated in a ROI, remains
nearly unchanged. ADC maps are more homogenous using the
wooden frame.
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