Document Detail

Image registration of pre-procedural MRI and intra-procedural CT images to aid CT-guided percutaneous cryoablation of renal tumors.
MedLine Citation:
PMID:  20499194     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To determine whether a non-rigid registration (NRR) technique was more accurate than a rigid registration (RR) technique when fusing pre-procedural contrast-enhanced MR images to unenhanced CT images during CT-guided percutaneous cryoablation of renal tumors.
METHODS: Both RR and NRR were applied retrospectively to 11 CT-guided percutaneous cryoablation procedures performed to treat renal tumors (mean diameter; 23 mm). Pre-procedural contrast-enhanced MR images of the upper abdomen were registered to unenhanced intra-procedural CT images obtained just prior to the ablation. RRs were performed manually, and NRRs were performed using an intensity-based approach with affine and Basis-Spline techniques used for modeling displacement. Registration accuracy for each technique was assessed using the 95% Hausdorff distance (HD), Fiducial Registration Error (FRE) and the Dice Similarity Coefficient (DSC). Statistical differences were analyzed using a two-sided Student's t-test. Time for each registration technique was recorded.
RESULTS: Mean 95% HD (1.7 mm), FRE (1.7 mm) and DSC (0.96) using the NRR technique were significantly better than mean 95% HD (6.4 mm), FRE (5.0 mm) and DSC (0.88) using the RR technique (P < 0.05 for each analysis). Mean registration times of NRR and RR techniques were 15.2 and 5.7 min, respectively.
CONCLUSIONS: The non-rigid registration technique was more accurate than the rigid registration technique when fusing pre-procedural MR images to intra-procedural unenhanced CT images. The non-rigid registration technique can be used to improve visualization of renal tumors during CT-guided cryoablation procedures.
Sota Oguro; Kemal Tuncali; Haytham Elhawary; Paul R Morrison; Nobuhiko Hata; Stuart G Silverman
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural     Date:  2010-05-25
Journal Detail:
Title:  International journal of computer assisted radiology and surgery     Volume:  6     ISSN:  1861-6429     ISO Abbreviation:  Int J Comput Assist Radiol Surg     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-04     Completed Date:  2011-05-24     Revised Date:  2014-09-24    
Medline Journal Info:
Nlm Unique ID:  101499225     Medline TA:  Int J Comput Assist Radiol Surg     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  111-7     Citation Subset:  IM    
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MeSH Terms
Aged, 80 and over
Cryosurgery / methods*
Image Processing, Computer-Assisted*
Kidney Neoplasms / diagnosis,  surgery*
Magnetic Resonance Imaging / methods*
Middle Aged
Monitoring, Intraoperative / methods*
Preoperative Care / methods*
Retrospective Studies
Tomography, X-Ray Computed / methods*
Grant Support
1R01CA124377/CA/NCI NIH HHS; 5U41RR019703/RR/NCRR NIH HHS; 5U54EB005149/EB/NIBIB NIH HHS; P41 RR019703/RR/NCRR NIH HHS; P41 RR019703-06/RR/NCRR NIH HHS; R01 CA124377/CA/NCI NIH HHS; R01 CA124377-01/CA/NCI NIH HHS; U54 EB005149/EB/NIBIB NIH HHS; U54 EB005149-01/EB/NIBIB NIH HHS

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