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Multi-Modality Image registration
Citation preview
By
Habib Baluwala
MULTI-MODALITY MEDICAL IMAGE REGISTRATION/FUSION
Medical Image Fusion
• Combines complementary information from different image modalities into a single image
• Revolutionized medical diagnosis
• Whole body Oncology
• Brain
• Cardiology
• Radiotherapy and surgical planning
• Helps to raise clinical value of certain modalities like PET
• Fusion Approaches
• Hybrid imaging – External markers
• Software approach
3
PET (Metabolic info) + CT (Anatomical info) = Fused Image
• Improved anatomical
localization
• Improved staging of
cancer
• Radiotherapy planning
• High spatial
resolution (as high as
0.5 mm)
• Good tissue
contrast
• Differentiate between
benign and malignant
tumours
• Better sensitivity in
the detection of distant
metastases
CT-PET HYBRID SCANNER
PET/MRI HYBRID SCANNERS
• Advantages
• No Ionizing radiation
• Better characterization of soft tissues , bone marrow and spine
• Disadvantages
• Attenuation correction is challenging
• Segmentation-based
• Atlas-based
Hybrid scanners
• Advantages
• More precise co-registration and anatomic localization
• Low computational complexity
• Disadvantages
• Not economical
• Full utilization of the device is seldom achieved
• Software registration might still be needed to compensate for non-rigid registration
Software approach - Registration
• Advantages
• Provides flexibility
• Economical
• Disadvantages
• Time-consuming
• Observer dependent
• Computationally expensive
Similarity function/ Cost function
• Segmentation based approaches
• Statistical voxel intensity-based approaches
• NMI (Normalised Mutual Information)
• MI (Mutual Information)
• NCC (Normalized cross correlation)
• Learning based similarity measures
• KL distance based(Kullback-Leibler distance)
Transformation model
• Optical flow
• Spline based methods
• Fluid registration
• Elastic registration
• Demon’s registration
Visualization of data • Adjacent (side-by-side) displays
• Window displays
• Fade in/out displays
• Checkerboard displays
• Gaze-contingent multi-modality displays
• Hybrid fused displays
• Interleaved video displays
New applications • Interventional radiology using ultrasound
• Ablation
• Biopsy
• Pain Management
• Ultrasound-CT registration
• External- markers based
• Software based
Final Words
• Email : [email protected]