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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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