L2 Flashcards
Typical anode angles range from ________, with _____ being the most common.
7° to 20°, with 12°
Angling the anode target allows for a large actual focal spot (to manage heat) while creating a smaller effective focal spot (for better image sharpness).
The Line Focus principle
A _________ results in a smaller effective focal spot but increases the anode heel effect (variation in X-ray intensity across the beam).
smaller anode angle
The area where electrons bombard the anode. A larger actual focal spot helps with heat dissipation.
Actual Focal spot
The projected X-ray beam area towards the patient. A smaller effective focal spot improves image sharpness.
Effective focal spot:
states that by angling the anode target, a large actual focal spot (for heat dissipation) can be maintained while creating a smaller effective focal spot (for sharper images).
The Line focus principle
Smaller effective focal spot (sharper images) but greater anode heel effect (variation in X-ray intensity across the
beam).
Smaller anode angle
Larger effective focal spot (less sharp images) but less anode heel effect (more uniform X-ray intensity).
Larger anode angle
The anode angle causes the intensity of the X-ray beam to be less on the anode side than on the cathode side.
THE ANODE-HEEL EFFECT
This is because the heel of the target is in the path of the beam and therefore absorbs some X-rays on that side.
THE ANODE-HEEL EFFECT
The anode side __________, reducing beam intensity.
absorbing more X-rays
The cathode side ___________, increasing intensity.
emitting more X-rays,
The ___________ of the X-ray beam is greater
on the cathode side.
percent intensity
The effect is more pronounced with ____________ and ___________
shorter (SIDSource-to-Image Distance) and larger IR (Image Receptor).
The intensity variation is more than _____ between the cathode and the anode.
40%
This variation causes differences in density on the _____________.
radiographic film
The effect is __________ when using larger field sizes and shorter Source-to-Image Distance (SID).
more pronounced.
Radiologic technologists should ____________ of the X-ray tube and position the thicker or denser part of the patient’s body on the cathode side for better image quality.
identify the cathode and anode sides
A ____________ can also be used to balance exposure.
compensating filter (wedge filter)
