Speaker
Hadijah NDAGIRE
Description
**ABSTRACT
BACKGROUND
Xray mammography is the most reliable method of detecting breast cancer being the method of choice for b treast screening program in many countries ,high mammogram s have to be obtained at a reduced breast dose in combination of correct equipment used
**Methodology**
linear attenuation coefficients for different types of breast tissue are similar in magnitude and the soft tissue contrast can be quite low tha is to say the main variable of mammographic imaging system that were consideerd in this study included contrast ,sharpness ,dose and noise
**Results**
contrast was made as high as possible by imaging with a low photon energy hence increased breast dose wasseen . contrast decreased by a factor of 6 between 15 and 20kev . the glandular tissue contrast fall below 0.1 for enegies above 28kev
unsharpness in the image contributor included receptor blur eas made as small as 0.1 -0.15mm full width at half maximum of a point of response function
Dose decreased rapidily with depth in tissue due to low energy Xray spectrum used at 20kev theere was dose increase by afactor 17 between thickness 2cm and 8cm of 30 between photon energies 19 and 30kev
for 8cm thick breast there was a dose increase of afactor of 30 between photon energies 19 and 30kev
image noise was a contributed from film grain and electronic noise
**conclusion**
In practice breast dose was acomprise made between the requirement s of low dose and high contrast. these factors are the important physical parameters for optimisation of protection in mammography
| Institution | Mulago National Referal Hospital Complex |
|---|---|
| Country | Uganda |
Primary author
Hadijah NDAGIRE
