D:-0.5 cm
Correct Answer:- Option-D
Question39:-The ability to demonstrate closely placed structures in the subject as separate entities in the image is
A:-Resolution
B:-Brightness
C:-Contrast
D:-None
Correct Answer:- Option-A
Question40:-In Cobalt-60 machine, which ray is used for external beam radiotherapy ?
A:-Alpha ray
B:-Beta ray
C:-Gamma ray
D:-Protons
Correct Answer:- Option-C
Question41:-Lymphatics of breast drain into
A:-Posterior intercostal lymph node
B:-Axillary lymph node
C:-Internal mammary lymph node
D:-All of the above
Correct Answer:- Option-D
Question42:-Contrast is more with screen film combination than direct X-ray exposure because
A:-X-ray to light conversion efficiency is more
-ray absorption efficiency is more
:-Screen is more sensitive to high energy radiation
D:-Screen is more sensitive to low energy radiation
Correct Answer:- Option-C
Question43:-Most common histopathology in cancer cervix is
A:-Squamous cell carcinoma
B:-Adenocarcinoma
:-Lymphoma
D:-Melanoma
Correct Answer:- Option-A
Question44:-Geometric unsharpness can be reduced by
A:-Reducing focal spot size
-Increasing object-image distance
C:-Decreasing focus-image distance
D:-Using tube with large focal spot size
Correct Answer:- Option-A
Question45:-IMRT refers to
A:-Intensive Modulated Radiotherapy
-Intensity Modulated Radiotherapy
C:-Image Modulated Radiotherapy
D:-None of the above
Correct Answer:- Option-B
Question46:-Most vascular part of bone is
A:-Epiphysis
B:-Metaphysis
C:-Diaphysis
D:-Epiphyseal cartilage
Correct Answer:- Option-B
Question47:-* (cd//m2)/(mR//sec)” is
A:-Brightness gain
-Minification gain
C:-Conversion factor
D:-Flux gain
Correct Answer:- Option-C
Question48:-Which interaction of X-rays is the basis of radiographic contrast between bone and soft tissues ?
A:-Photoelectric effect
B:-Contrast scattering