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Assessment of cold sink effect in postulated renal cryoablation by analyzing radiographic ice ball on computed tomography

 Sung Yoon Park  ;  Jong Yun Won  ;  Young Taik Oh  ;  Dae Chul Jung  ;  Gyoung Min Kim  ;  Man Deuk Kim 
 BRITISH JOURNAL OF RADIOLOGY, Vol.92 : 20170951, 2019 
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OBJECTIVE: We analyzed CT characteristics of radiographic ice ball according to anatomical location and freezing number in renal cryoablation. METHODS: 30 patients who underwent percutaneous cryoablation for renal lesions. Computed tomography (CT) was conducted at 9 min during every freezing in order to evaluate a radiographic ice ball. Software was used to reconstruct CT images of the radiographic ice ball perpendicular to cryoprobes. For each radiographic ice ball, two types of radius were measured: (a) lateral radius from epicenter to perirenal direction and (b) medial radius from epicenter to renal sinus direction. Lateral and medial radius or diameters (lateral radius plus medial radius) during the first and second freezing were compared using paired t-test, respectively. RESULTS: Medial radius of radiographic ice ball was significantly shorter than lateral radius (first freezing, 13.8 vs 17.0 mm, p < 0.001; second freezing, 16.0 vs 19.3 mm, p < 0.001). The diameter during the second freezing was significantly longer than that during the first freezing (35.3 vs 30.8 mm, p < 0.001). CONCLUSION: In renal cryoablation, evaluating radiographic ice ball helps identify potential postulated cold sink effect in the central portion of kidney. Advances in knowledge: Radiologic information of postulated cold sink effect in the kidney may help secure sufficient safety margins.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Gyoung Min(김경민) ORCID logo https://orcid.org/0000-0001-6768-4396
Kim, Man Deuk(김만득) ORCID logo https://orcid.org/0000-0002-3575-5847
Oh, Young Taik(오영택) ORCID logo https://orcid.org/0000-0002-4438-8890
Won, Jong Yun(원종윤) ORCID logo https://orcid.org/0000-0002-8237-5628
Jung, Dae Chul(정대철) ORCID logo https://orcid.org/0000-0001-5769-5083
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