Spatial transforms and image registration assignment

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Reference no: EM132660961

PHYS2134 Advanced Medical Imaging - RMIT University

Spatial Transforms & Image Registration Assignment

(Question 1)
Use the DIRART Program to register the DEFGEL images using each of the Original Horn and Schunck Method, Original Demons Method, and Fast Demon Method algorithms using the default parameters.
(a) Compare the computation time for the three methods.
(b) Visually inspect the difference maps after registration and rank the algorithms in terms of accuracy.
(c) Compare the cross-correlations after registration (Postprocessing → Similarity Measurement). Is the ranking the same?
(d) Visually compare the motion fields and comment on any similarities or differences.

(Question 2)
(i) Register the DEFGEL images using the Original Horn and Schunck Method with the default parameters except "Smoothing during iteration" set to 1
(ii) Reverse the registration direction.
(iii) Change "Stages to Use" to 1.

(a) Did this smoothing setting improve the registration compared to Q1? (It may help to look at fiducial marker locations)
(b) Compare the cross correlations after registering in each direction. Does registration direction matter for this algorithm?
(c) Why did using only one multi-grid stage not work?

(Question 3)
Use the Original Horn and Schunck Method with the default parameters to register the end- inspiration to the end-expiration breathing phase for both "Kidney_SABR_normal" and "Kidney_SABR_deep".
(a) Use difference maps and similarity measures to compare the results.
(b) Comment on the effect of the magnitude of motion.

(Question 4)
The triangle Q is defined by the points a(2,6), b(2,10), c(6,8). Using a 3D combination matrix approach, apply the transformation to Q which firstly translates Q by 4 in the x-direction, then -3 in the y-direction, and then rotates Q anti-clockwise by 90 degrees about (0,0).

(Question 5)
If the question asked you to rotate Q about some other point, say (3,4), what steps would you take to calculate a solution? A full solution is not required but a statement of the steps and the relevant transformation(s) is required.

Reference no: EM132660961

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