| Image registration of pre-procedural MRI and intra-procedural CT images to aid CT-guided percutaneous cryoablation of renal tumors. | |
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MedLine Citation:
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PMID: 20499194 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Sota Oguro; Kemal Tuncali; Haytham Elhawary; Paul R Morrison; Nobuhiko Hata; Stuart G Silverman |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural Date: 2010-05-25 |
Journal Detail:
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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:
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Created Date: 2011-01-04 Completed Date: 2011-05-24 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 101499225 Medline TA: Int J Comput Assist Radiol Surg Country: Germany |
Other Details:
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Languages: eng Pagination: 111-7 Citation Subset: IM |
Affiliation:
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Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA. sota@bwh.harvard.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Aged, 80 and over Cryosurgery / methods* Female Humans Image Processing, Computer-Assisted* Kidney Neoplasms / diagnosis, surgery* Magnetic Resonance Imaging / methods* Male Middle Aged Monitoring, Intraoperative / methods* Preoperative Care / methods* Retrospective Studies Tomography, X-Ray Computed / methods* |
| Grant Support | |
ID/Acronym/Agency:
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1R01CA124377/CA/NCI NIH HHS; 5U41RR019703/RR/NCRR NIH HHS; 5U54EB005149/EB/NIBIB NIH HHS; P41 RR019703-06/RR/NCRR NIH HHS; R01 CA124377-01/CA/NCI NIH HHS; R01 CA124377-05/CA/NCI NIH HHS; U54 EB005149-01/EB/NIBIB NIH HHS |
| Comments/Corrections | |
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