PURPOSE: Virtual CT sonography using magnetic navigation provides cross sectional images of CT volume data corresponding to the angle of the transducer in the magnetic field in real-time. The purpose of this study was to clarify the value of this virtual CT sonography for treatment response of radiofrequency ablation for @entity157 . @entity1 AND METHODS: Sixty-one @entity1 with 88 HCCs measuring 0.5-1.3 cm (mean  SD, 1.0  0.3 cm) were treated by radiofrequency ablation. For early treatment response, dynamic CT was performed 1-5 days (median, 2 days). We compared early treatment response between axial CT images and multi-angle CT images using virtual CT sonography. RESULTS: @entity41 stains on axial CT images and multi-angle CT images were detected in 11.4% (10/88) and 13.6% (12/88) after the first session of RFA, respectively (P=0.65). Two @entity1 were diagnosed as showing @entity450 enhancement after the initial radiofrequency ablation on axial CT images and showed @entity5 progression shortly because of unnoticed @entity41 . Only virtual CT sonography with magnetic navigation retrospectively showed the @entity41 as circular enhancement. In safety margin analysis, 10 @entity1 were excluded because of @entity41 . The safety margin more than 5 mm by virtual CT sonographic images and transverse CT images were determined in 71.8% (56/78) and 82.1% (64/78), respectively (P=0.13). The safety margin should be overestimated on axial CT images in 8 nodules. CONCLUSION: Virtual CT sonography with magnetic navigation was useful in evaluating the treatment response of radiofrequency ablation therapy for @entity157 .

Treatment response assessment of radiofrequency ablation for XXXX : usefulness of virtual CT sonography with magnetic navigation.

@entity1 :: ('9606', 'Species') :: ['patients', 'PATIENTS'] @entity41 :: ('MESH:D018365', 'Disease') :: ['residual tumors', 'residual tumor', 'Residual tumor'] @entity5 :: ('MESH:D009369', 'Disease') :: ['local tumor'] @entity450 :: ('MESH:D006940', 'Disease') :: ['hyperemia'] @entity157 :: ('MESH:D006528', 'Disease') :: ['hepatocellular carcinoma']
@entity157 :: (MESH:D006528,Disease) :: ['hepatocellular carcinoma']
