Biomedical Engineering > GATE 2020 > X-ray Imaging
An X-ray radiography scenario is shown in the figure. If the number of incident photons (Ni) is equal to 2 × 10⁶ at 50 keV, the number of photons (Nd) that exit the tissue is _______ × 10⁶ (rounded off to two decimal places). (use linear attenuation coefficient for soft tissue and blood at 50 keV as 0.4 cm⁻¹ and 0.2 cm⁻¹ respectively). 
Correct : 0.5 to 0.6
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