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Image Registration
Quality Indicator
Importance Rating
(9,essential)
MRI registration to CT consists of a prostate-to-prostate local
registration. Bone-to-bone registration of the pelvis is
discouraged.
8,7
The quality of image registration must be evaluated by a
physicist and/or physician prior to treatment planning.
Rotations should be carefully scrutinized. Errors in
registration translate to systematic errors that propagate
through the treatment course, and must be minimized.
7,8
In salvage after prostatectomy, users should use great care to
consider and mitigate variation in bladder and bowel filling
between CT and MRI, and to reproduce treatment conditions.
The potential for registration error is considered large in this
setting. Accurate registration at the level of the external urethral
sphincter and gross recurrent tumour (if present) is prioritised.
7.7
Inter-sequence motion of the prostate gland during an
MRI examination may occur. Such displacements must
be evaluated and corrected if present. DWI may require
registration to T2w when distortions are observed.
7.2