Abstract:
The Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature (STP) is defined as zero Hounsfield units (HU), while the radiodensity of air at STP is defined as -1000 HU .
The study was done in Royal Care International Hospital in period from April 2014 up to April 2015 , using Toshiba 64 slice ,KV=120 ,mA=300 , Time of rotation =0.75s . The study was done to evaluate the relation between CT number and AP Abdominal diameter , And to correlate the finding with age , weight , in both gender . 50 patients were selective there ages between 24 up to 78 years old .
All were scaned for Axial CT for abdomen , All liver segment were evaluated and measured using Hounsfield unit . the AP dimension at the same level was measured of the distant frpm superior abdominal wall to superior end of the abdominal muscles in (mm) .
The current study aimed to study the liver of Sudanese patients by measuring(mm) the CT number (51.2, 50.9, 52.2, 53.5, 52, 51.8, 52.1, 50.2) in segment 1,2,3,4,5,6,7,8, and Correlations are Significant at P-Value= 0.005 for all of the values including segment's with age , weight and AP fat thickness .There were significant difference between both gender for the measured values .
The equation were established to predict the CT number of the liver for the subjects with known AP abdominal fat thickness . The study concluded that CT scan is a non invasive a knowledge muscle to measure the liver CT number and evaluate its Texture .
