Anode Heel Effect

Question 1

anode heel effect

Answer 1

radiographic phenomenon affecting the intensity of the x-ray beam causing x-ray photons to be absorbed

Question 2

the anode angle will increase the surface area of the ______ _____ and will therefore increase the ability of anode to _________ _____.

Answer 2

focal spot

absorb heat

Question 3

the anode angle will decrease the _____ size which will increase ________ ___________.

Answer 3

EFS

spatial resolution

Question 4

a larger number of x-ray photons will be produced at the cathode side of the x-ray tube due to what?

Answer 4

the angle of the anode

Question 5

Why does the cathode side have a higher intensity than the anode side?

Answer 5

the absorption of the photons deep in the anode heel

Question 6

What produces the anode heel effect?

Answer 6

a number of photons deep in the anode never escape the target so they are absorbed in the anode heel

Question 7

variables affecting anode heel effect

Answer 7

SID
anode target angle
image field size

Question 8

The relationship between the anode heel effect and the SID is what?

Answer 8

indirect

Question 9

What does less angle mean?

Answer 9

more anode that a photon needs to escape to become part of the beam

Question 10

What does more angle mean?

Answer 10

less anode that a photon needs to escape to become part of the beam

Question 11

The relationship between the anode angle and anode heel effect is what?

Answer 11

indirect

Question 12

The relationship between the field size and anode heel effect is what?

Answer 12

direct

Question 13

What can happen when the anode heel effect causes a variation of intensity of photons across the x-ray field?

Answer 13

uneven exposure to the IR

Question 14

FAT CAT

Answer 14

place the thickest part of the patient underneath the cathode end of the x-ray tube

Question 15

Why do you place the thickest part under the cathode end?

Answer 15

it will provide a greater number of photons to penetrate and image the thicker parts

Question 16

What can the heel effect be used effectively for in radiography?

Answer 16

femur
lower leg
humerus
thoracic spine
and lumbar spine

Question 17

Which of the following will decrease the anode heel effect?

A. Decrease SID, increased field size, and increased anode angle
B. Increase SID, decreased field size, and decreased anode angle
C. Decrease SID, increased field size, and decreased anode angle
D. Increased SID, decreased field size, and increased anode angle

Answer 17

D. increased SID, decreased field size, and increased anode

Question 18

Define exit beam

Answer 18

beam that is exiting the patient to the IR

Question 19

Define useful beam

Answer 19

beam exiting the tube that is heading towards the patient

Question 20

What SID will lead to increased anode heel affect?

Answer 20

the smallest

Question 21

The anode heel effect causes what 2 things?

Answer 21

variation of beam’s intensity across field

a greater intensity of x-rays on the cathode side

Question 22

Increased x-ray photons on the cathode side of the beam describes:

Answer 22

the anode heel effect

Question 23

What will occur when the angle of the anode increases?

Answer 23

increased ability in anode to absorb heat

decreased anode heel effect

decreased spatial resolution

Question 24

What SID will lead to a decreased anode heel effect?

Answer 24

the highest amount

Question 25

Increasing the field size will result in:

Answer 25

increased anode heel effect

Question 26

What factors will increase the anode heel effect?

Answer 26

decreased SID increased field size decreased anode angle

Question 27

What factors will decrease the anode heel effect?

Answer 27

increased SID decreased field size increased anode angle

Question 28

The use of an x-ray tube with a large anode angle results in which two of the following? increased heel effect increased focal spot size increased heat capacity decreased heat capacity

Answer 28

increased focal spot increased heat capacity

Question 29

The anode side of the x-ray field demonstrates:

Answer 29

lower intensity

Question 30

What is the anode heel effect caused by?

Answer 30

x-ray absorption within the anode

Question 31

Directing the anode side of the tube towards the toes in an AP projection of the foot results in:

Answer 31

more uniform receptor exposure

Question 32

The use of an x-ray tube with a small anode angle results in which two of the following? decreased heel effect decreased focal spot size increased focal spot size decreased heat capacity

Answer 32

decreased focal spot size decreased heat capacity

Question 33

What exposure modification will increase the anode heel effect?

Answer 33

decreased SID

Question 34

the cathode side always has what than the CR?

Answer 34

a higher intensity

Question 35

Which of the following is a potentially negative consequence of an increased anode angle? decreased effective focal spot decreased anode heel effect increased effective focal spot increased anode heel effect

Answer 35

increased effective focal spot

Question 36

an increased effective focal spot size will lead to:

Answer 36

decreased spatial resolution

Question 37

Which of the following occurs when the anode angle decreases? EFS size decreases and heel effect decreases EFS size decreases and heel effect increases EFS size increases and heel effect increases EFS size increases and heel effect decreases

Answer 37

EFS size decreases and heel effect increases