What post processing technique would be used to re register an image to correct for patient motion?

Pixel shift or reregistration is a post-processing technique used to improve misregistration artifact in digital subtraction angiography, where two images to be subtracted are spatially realigned with respect to one another, by shifting pixels vertically, horizontally or obliquely.

Pixel shifting may be performed manually or through the use of automated techniques.

In digital subtraction angiography, misregistration is the most common cause of image degradation, where patient motion results in a spatial misalignment between the mask and runoff images.

1. Penelope Allisy-Roberts, Jerry R. Williams. Farr's Physics for Medical Imaging. (2020) ISBN: 9780702028441
2 .Christopher M. Kramer. Imaging in Peripheral Arterial Disease. (2019) ISBN: 9783030245962

Remasking is a post-processing technique used to improve misregistration artifact in digital subtraction angiography, where a frame taken after patient motion is selected as the new mask image for subtraction.

In digital subtraction angiography, misregistration (improper image registration) is the most common cause of image degradation, where patient motion results in a spatial misalignment between the mask and runoff images.

1. Penelope Allisy-Roberts, Jerry R. Williams. Farr's Physics for Medical Imaging. (2020) ISBN: 9780702028441

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Patient image quality score and correlation coefficient of respiratory motion trajectory between MoCoAve and non-MoCoAve image sets

No.	Age (y)	Sex	Tumor location	Image acquisition type	MocoAve/non-MocoAve	Motion trajectory
aSNR	Image score	Sharpness	σ_GTV	Absolute difference (SI, mm)	Correlation coefficient
SI	AP	ML
1	72	M	Lung	SOS	28.3/13.9	3/1.5	0.42/0.40	–	1.18	0.83	−0.36	0.68
2	74	M	Liver	SOS‡	37.8/15.2	3/1	0.36/0.37	–	0.39	0.75	0.70	0.35
3	53	M	Pancreas	SOS	61.8/22.5	2.5/1	0.28/0.26	4.41/4.49	0.36	0.93	0.48	0.65
4	79	M	Pancreas	SOS†	10.9/5.0	2.5/1	0.41/0.42	1.72/2.78	0.49	0.95	0.79	0.45
5	69	M	Pancreas	SOS	49.6/21.1	3/2	0.34/0.34	1.84/2.66	0.37	0.92	0.86	0.32
6	79	M	Pancreas	KB†	19.5/16.8	2/1	0.39/0.40	1.72/1.54	0.06	0.97	0.93	0.44
7	74	M	Liver	KB‡	25.9/17.3	2/1	0.28/0.30	–	0.15	0.78	0.69	0.24
8	79	M	Pancreas	KB	51.8/34.0	2.5/1.5	0.42/0.45	0.95/1.87	0.54	0.95	−0.21	0.20
9	79	F	Pancreas	KB	36.1/19/1	3/1	0.35/0.36	0.34/1.07	0.12	0.96	0.49	0.15
10	35	M	Pancreas	KB	45.0/18.16	3/1	0.36/0.35	0.72/2.73	0.66	0.99	0.32	0.66
11	72	F	Pancreas	KB	46.6/26.1	2.5/1	0.43/0.42	0.14/0.20	0.88	0.96	0.93	−0.04
Mean (STD)	68 (15)				37.6/18.1 (15.3)/(5.7)	2.64/1.18 (0.39)/(0.34)	0.367/0.369 (0.068)/(0.072)	1.48/2.17 (1.35)/(1.31)	0.47 (0.34)	0.91 (0.08)	0.51 (0.44)	0.37 (0.23)
p-value					0.001	0.001	0.805	0.039