Spectrometer is a key control unit in magnetic resonance imaging (MRI) systems. Pulse programmer of the spectrometer outputs multi-channel instructions to control each hardware component separately, and to coordinate work, collect data, and reconstruct image. Relative time delay among the hardware components may disable the system, or affect the quality of the images acquired. This work designed a pulse programmer whose output channels all boasted adjustable time delay capability. The maximal time delay for each channel was 819 μs, and the step time delay was 50 ns. As such, accurate compensation to relative time delay could be achieved. By adding independent delay circuits on every output channel of the pulse programmer, adjustable time delay capability was achieved. The pulse programmer proposed has the advantages of simple structure and high flexibility.
HU Kun
,
NING Rui-peng
. A Pulse Programmer with Independent Delay Capability[J]. Chinese Journal of Magnetic Resonance, 2017
, 34(3)
: 347
-356
.
DOI: 10.11938/cjmr20162542
[1] HASHIMOTO S, KOSE K, HAISHI T. Development of a pulse programmer for magnetic resonance imaging using a personal computer and a high-speed digital input-output board[J]. Rev Sci Instrum, 2012, 83(5):053702.
[2] HANDA S, DOMALAIN T, KOSE K. Single-chip pulse programmer for magnetic resonance imaging using a 32-bit microcontroller[J]. Rev Sci Instrum, 2007, 78(8):084705.
[3] MAO W P, BAO Q J, YANG L, et al. A modularized pulse programmer for NMR spectroscopy[J]. Meas Sci Technol, 2011, 22(2):025901.
[4] NING R P, YANG G, Li G Y. A versatile pulse programmer for magnetic resonance imaging[J]. Rev Sci Instrum, 2011, 82(5):054301.
[5] SHEN J, XU Q, LIU Y, et al. Home-built magnetic resonance imaging system (0.3 T) with a complete digital spectrometer[J]. Rev Sci Instrum, 2005, 76(10):105101.
[6] ZHANG Z, MAO W P, LIU C Y. Progress in the development of pulse programmer for nuclear magnetic resonance[J]. Chinese J Magn Reson, 2012, 29(3):339-345. 张志, 毛文平, 刘朝阳. 核磁共振脉冲序列发生器研究进展[J]. 波谱学杂志, 2012, 29(3):339-345.
[7] JI W B, QIAO Y, LEI D, et al. Hardware design for general-purpose pulse generator used in NMR spectrometers[J]. Chinese J Magn Reson, 2007, 24(3):321-327. 季文彬, 乔勇, 雷都, 等. 通用硬件脉冲序列发生器的研制[J]. 波谱学杂志, 2007, 24(3):321-327.
[8] 宁瑞鹏. 用于引导HIFU治疗的永磁开放式MRI系统研究[D]. 上海:华东师范大学, 2011.
