Assessment of thermal sensitivity of CT during heating of liver: an ex vivo study.
Br J Radiol
; 85(1017): e661-5, 2012 Sep.
Article
in En
| MEDLINE
| ID: mdl-22919016
ABSTRACT
OBJECTIVES:
The purpose of this study was to assess the thermal sensitivity of CT during heating of ex-vivo animal liver.METHODS:
Pig liver was indirectly heated from 20 to 90 °C by passage of hot air through a plastic tube. The temperature in the heated liver was measured using calibrated thermocouples. In addition, image acquisition was performed with a multislice CT scanner before and during heating of the liver sample. The reconstructed CT images were then analysed to assess the change of CT number as a function of temperature.RESULTS:
During heating, a decrease in CT numbers was observed as a hypodense area on the CT images. In addition, the hypodense area extended outward from the heat source during heating. The analysis showed a linear decrease of CT number as a function of temperature. From this relationship, we derived a thermal sensitivity of CT for pig liver tissue of -0.54±0.03 HU °C(-1) with an r(2) value of 0.91.CONCLUSIONS:
The assessment of the thermal sensitivity of CT in ex-vivo pig liver tissue showed a linear dependency on temperature ≤90 °C. This result may be beneficial for the application of isotherms or thermal maps in CT images of liver tissue.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Body Temperature
/
Thermography
/
Radiographic Image Interpretation, Computer-Assisted
/
Tomography, X-Ray Computed
/
Liver
Type of study:
Diagnostic_studies
Limits:
Animals
Language:
En
Journal:
Br J Radiol
Year:
2012
Document type:
Article
Affiliation country: