KEYWORDS: Signal to noise ratio, Magnetic resonance imaging, 3D image reconstruction, Stereoscopy, X-rays, 3D image processing, Image processing, Image resolution, Point spread functions, Magnetism
In conventional 3D Fourier transform (3DFT) MR imaging, signal-to-noise ratio (SNR) is governed by the well-known
relationship of being proportional to the voxel size and square root of the imaging time. Here, we introduce an alternative
3D imaging approach, termed MRT (Magnetic Resonance Tomosynthesis), which can generate a set of tomographic MR
images similar to multiple 2D projection images in x-ray. A multiple-oblique-view (MOV) pulse sequence is designed to
acquire the tomography-like images used in tomosynthesis process and an iterative back-projection (IBP) reconstruction
method is used to reconstruct 3D images. SNR analysis is performed and shows that resolution and SNR tradeoff is not
governed as with typical 3DFT MR imaging case. The proposed method provides a higher SNR than the conventional
3D imaging method with a partial loss of slice-direction resolution. It is expected that this method can be useful for
extremely low SNR cases.
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