Temperature measurements of the low-attenuation radiographic ice ball during CT-guided renal cryoablation Journal Article
| Authors: | Permpongkosol, S.; Link, R. E.; Kavoussi, L. R.; Solomon, S. B. |
| Article Title: | Temperature measurements of the low-attenuation radiographic ice ball during CT-guided renal cryoablation |
| Abstract: | During renal cryoablation a low-attenuation area on CT develops around the cryoprobe. Knowledge of the temperature of the growing low-attenuation area can guide therapy and ensure lethal temperatures. Herein, we report thermocouple results and correlating CT images during the development of the low-attenuation "radiographic ice ball." Five patients who underwent percutaneous CT-guided renal cryoablation were identified who had thermocouples inserted and serial intraprocedural CT images that included images with thermocouple measurements of 0° and sub-0°C. Thermocouples had been percutaneously placed just beyond the edge of the tumors either to ensure adequate cooling or to ensure safety to adjacent critical structures. Renal cryotherapy under CT guidance produced a growing low-attenuation area corresponding to the radiographic ice ball. When the thermocouple measured 0°C, CT images showed the thermocouple tip at the edge of the low-attenuation ice ball. At lower temperatures the tip was within the low-attenuation ice ball. We conclude that knowledge of the temperature at the ice ball edge during cryoablation can be used to predict the extent of tissue necrosis and thus provide an estimate of cryotherapy effectiveness during the procedure. Further work is necessary to establish a firm relationship between the thermal conditions and the zone of damage. © 2007 Springer Science+Business Media, LLC. |
| Keywords: | adult; clinical article; treatment outcome; aged; middle aged; surgical technique; follow-up studies; computer assisted tomography; tomography, x-ray computed; necrosis; kidney neoplasms; correlation analysis; kidney; kidney tumor; carcinoma, renal cell; feasibility studies; biopsy, needle; predictive value of tests; radiography, interventional; contrast media; cryoablation; temperature measurement; cryosurgery; computed tomography; radiographic image enhancement; cold; tissue necrosis; computer assisted surgery; ice ball edge; renal tumor; temperature determination; low temperature; radiation attenuation |
| Journal Title: | CardioVascular and Interventional Radiology |
| Volume: | 31 |
| Issue: | 1 |
| ISSN: | 0174-1551 |
| Publisher: | Springer |
| Date Published: | 2008-01-01 |
| Start Page: | 116 |
| End Page: | 121 |
| Language: | English |
| DOI: | 10.1007/s00270-007-9220-5 |
| PUBMED: | 17987248 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 8" - "Export Date: 17 November 2011" - "CODEN: CARAD" - "Source: Scopus" |
