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ViP MRI: virtual phantom magnetic resonance imaging.

Abstract : OBJECT: The ability to generate reference signals is of great benefit for quantitation of the magnetic resonance (MR) signal. The aim of the present study was to implement a dedicated experimental set-up to generate MR images of virtual phantoms. MATERIALS AND METHODS: Virtual phantoms of a given shape and signal intensity were designed and the k-space representation was generated. A waveform generator converted the k-space lines into a radiofrequency (RF) signal that was transmitted to the MR scanner bore by a dedicated RF coil. The k-space lines of the virtual phantom were played line-by-line in synchronization with the magnetic resonance imaging data acquisition. RESULTS: Virtual phantoms of complex patterns were reproduced well in MR images without the presence of artifacts. Time-series measurements showed a coefficient of variation below 1 % for the signal intensity of the virtual phantoms. An excellent linearity (coefficient of determination r (2) = 0.997 as assessed by linear regression) was observed in the signal intensity of virtual phantoms. CONCLUSION: Virtual phantoms represent an attractive alternative to physical phantoms for providing a reference signal. MR images of virtual phantoms were here generated using a stand-alone, independent unit that can be employed with MR scanners from different vendors.
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Submitted on : Thursday, January 9, 2014 - 3:56:58 PM
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Hervé Saint-Jalmes, Pierre-Antoine Eliat, Johanne Bezy-Wendling, Alejandro Bordelois, Giulio Gambarota. ViP MRI: virtual phantom magnetic resonance imaging.. Magnetic Resonance Materials in Physics, Biology and Medicine, Springer Verlag, 2013, 27 (5), pp.419-24. ⟨10.1007/s10334-013-0425-0⟩. ⟨inserm-00921891⟩



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