Short Report: A Sponge Phantom Provides a Homogeneous k-Space Pattern at MRI

• 作者: Jan Menke
• 来源期刊: 放射学期刊(英文)
• 学科: 医学
• 关键词: Magnetic Resonance Imaging Phantoms Fourier ANALYSIS Spectrum ANALYSIS COMPUTER-ASSISTED Image Processing
• 年，卷（期）: 2014,（2）
• 页码范围: 195-200
• 页数: 6页
• 分类号: R73

摘要

Background: The spectral coverage of magnetic resonance (MR) sequences can be well assessed in k-space. However, many objects do not provide high signal intensities in the peripheral k-space. Purpose: To experimentally find a phantom that provides a homogeneous spectral pattern also at the high spatial frequencies of the k-space periphery. Material and Methods: Different phantoms were imaged on a 1.5 Tesla magnet, and the resulting MR images were viewed in k-space after fast Fourier transform. Results: Firstly, phantoms with a homogeneous physical structure were studied with a T2-weighted MR sequence, but they provided an inhomogeneous k-space pattern with dominant central low-frequency components. Secondly, phantoms with an inhomogeneous physical structure were studied. In this group, a water-soaked sponge showed a relatively homogeneous k-space pattern also at high spatial frequencies, owing to the fine porous structure. This sponge phantom can also be soaked with Gadolinium chelates for T1-weighted MR imaging. Conclusion: A simple sponge phantom provides a homogeneous k-space pattern, owing to its fine porous structure. This could be utilized in MR sequence development and for viewing the spectral coverage of MR sequences in k-space.