2-POINT INTERFERENCE METHOD FOR SUPPRESSION OF GHOST ARTIFACTS DUE TO MOTION

被引:23
作者
XIANG, QS
BRONSKILL, MJ
HENKELMAN, RM
机构
[1] Department of Medical Biophysics and the Sunnybrook Health Science Centre, Research, University of Toronto, Ontario
来源
JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1993年 / 3卷 / 06期
关键词
ARTIFACT; IMAGE PROCESSING; MOTION CORRECTION;
D O I
10.1002/jmri.1880030618
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
A two-point interference method is introduced for suppression of ghosting due to motion in magnetic resonance imaging. The method requires only two time-interleaved data acquisitions, without any monitoring of the motion. A postprocessing technique is used to produce a weighted sum of the two acquired images, in which ghosts are suppressed by interference through an automatic regional tuning procedure. The appropriate complex weighting factors are regionally chosen by minimizing the ''gradient energy,'' which is defined as the sum of squared pixel values in the partial-derivative maps. The method was tested in both phantoms and volunteers with a variety of imaging protocols. The level of ghost suppression with the two-point method was found to be comparable to that of the three-point method described previously by the authors.
引用
收藏
页码:900 / 906
页数:7
相关论文
共 15 条
[1]  
Schultz CL, Alfidi RJ, Nelson AD, Kopiwoda SY, Clampitt ME, The effect of motion on two‐dimensional Fourier transformation magnetic resonance images, Radiology, 152, pp. 117-121, (1984)
[2]  
Wood ML, Henkelman RM, MR image artifacts from periodic motion, Med Phys, 12, pp. 143-151, (1985)
[3]  
Felmlee JP, Ehman RL, Spatial presaturation: a method for suppressing flow artifacts and improving depiction of vascular anatomy in MR imaging, Radiology, 164, pp. 559-564, (1987)
[4]  
Pattany PM, Philips JJ, Chin L, Et al., Motion artifact suppression technique (MAST) for MR imaging, J Comput Assist Tomogr, 11, pp. 369-377, (1987)
[5]  
Xiang QS, Nalcioglu O, A formalism for generating multiparametric encoding gradients in NMR tomography, IEEE Trans Med Imaging, 1001-1006, pp. 14-20, (1987)
[6]  
Stark DD, Wittenberg J, Edelman RR, Et al., Detection of hepatic metastases: analysis of pulse sequence performance in MR imaging, Radiology, 159, pp. 365-370, (1986)
[7]  
Runge VM, Clanton JA, James AE, Respiratory gating in magnetic resonance imaging at 0.5 Tesla, Radiology, 151, pp. 521-523, (1984)
[8]  
Crooks LE, Barker B, Chang H, Et al., Magnetic resonance imaging strategies for heart studies, Radiology, 153, pp. 459-465, (1984)
[9]  
Bailes DR, Gilderdale DJ, Bydder GM, Collins AG, Firmin DN, Respiratory ordered phase encoding (ROPE): a method for reducing respiratory motion artifacts in MR imaging, J Comput Assist Tomogr, 9, pp. 835-838, (1985)
[10]  
Hinks RS, Monitored echo gating (MEGA) for the reduction of motion artifacts (abstr), Magn Reson Imaging, 6, (1988)