Home › Guides
Radiation therapy image matching guides
Plain-English explainers on how setup-imaging registration actually works — the same skills you practice in the trainer. Written for radiation therapy students, therapists, and anyone learning IGRT.
Browse the guides
7 guides
-
What is IGRT?
The big picture: what image-guided radiation therapy is, why it matters for margins and dose, the main imaging modalities, and online vs offline correction. -
kV vs MV imaging
How kilovoltage and megavoltage setup imaging differ — contrast, dose, the on-board imager and EPID, planar vs CBCT, and when a therapist uses each. -
CBCT 6DOF registration explained
What cone-beam CT registration is, the six degrees of freedom, the matching workflow, window/level and fusion, tolerances, and the mistakes to avoid. -
2D/2D portal vs DRR matching
How orthogonal portal images are matched to DRRs, why it's a 5DOF correction, which bony landmarks to use, and how 2D/2D compares to CBCT. -
Couch shifts & 6DOF corrections
The six degrees of freedom, the Lat/Lng/Vrt and pitch/roll/yaw read-out, 5DOF vs 6DOF couches, and how action levels decide treat vs intervene. -
Prostate fiducial marker matching
Why gold seeds are implanted, how kV 2D/2D and CBCT marker matching works, why three markers give a full 6DOF read-out, and fiducial vs bony match. -
DIBH deep inspiration breath-hold
Why breath-hold spares the heart in left-breast treatment, how the gating window and surface/respiratory monitoring work, and what good breath-hold coaching looks like.
No guides found
Try another term or clear your filters to see every guide.
Image-matching glossary
Every term in one place: IGRT, CBCT, DRR, isocentre, 6DOF, fiducials, MLC, DIBH and the rest of the vocabulary you meet at the treatment console — in plain English.
Practice on real casesBrain, pelvis, thorax, breast, spine SBRT, lung SBRT, acoustic neuroma and prostate fiducials — 2D/2D and CBCT, with live residual-error feedback.
Open the trainerEducational use only. These guides and the trainer are for learning. This is not a medical device and not for clinical decision-making. All patient offsets and values in the trainer are fictional; imaging derives from publisher-released research collections made available under open licences (see source-specific privacy evidence and image credits).