Int J Comput Assist Radiol Surg - Image registration of pre-procedural MRI and intra-procedural CT images to aid CT-guided percutaneous cryoablation of renal tumors.

Tópicos

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Resumo

RPOSE: 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.

Resumo Limpo

rpose determin whether nonrigid registr nrr techniqu accur rigid registr rr techniqu fuse preprocedur contrastenhanc mr imag unenhanc ct imag ctguid percutan cryoablat renal tumorsmethod rr nrr appli retrospect ctguid percutan cryoablat procedur perform treat renal tumor mean diamet mm preprocedur contrastenhanc mr imag upper abdomen regist unenhanc intraprocedur ct imag obtain just prior ablat rrs perform manual nrrs perform use intensitybas approach affin basissplin techniqu use model displac registr accuraci techniqu assess use hausdorff distanc hd fiduci registr error fre dice similar coeffici dsc statist differ analyz use twosid student ttest time registr techniqu recordedresult mean hd mm fre mm dsc use nrr techniqu signific better mean hd mm fre mm dsc use rr techniqu p analysi mean registr time nrr rr techniqu min respectivelyconclus nonrigid registr techniqu accur rigid registr techniqu fuse preprocedur mr imag intraprocedur unenhanc ct imag nonrigid registr techniqu can use improv visual renal tumor ctguid cryoablat procedur

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