Medical Imaging

Question 1

xrays travel at the speed of ____ in a vacuum

Answer 1

light

Question 2

the ________ of an xray tube is a negatively charged elecrode, while the ________ of an xray tube is a positively charged electrode.

Answer 2

cathode, anode

Question 3

in an xray tube, electrons flow from ________ to ______.

Answer 3

cathode, anode

Question 4

___________ refers to the boiling off of electrons from the wire _______

Answer 4

thermionic emission, filament

Question 5

the ______ of the xray beam indicated the number of xray photons in the primary beam, and the ________ of the xray beam indicates its penetrating power

Answer 5

quanity, quality

Question 6

The quality of the xray beam refers to its energy level. Therefore, adjusting the _____ affters the quality of the xray beam.

Answer 6

kVp

Question 7

______ determines the number of electrons flowing in the tube and the quantity of the xrays produced

Answer 7

mA

Question 8

what is the unit used to measure tube current?

Answer 8

mA

Question 9

what is one task you can complete to extend xray tube life?

Answer 9

warming it up

Question 10

as electrons strie the andoe target, __ percent of their kinetic energy is converted to heat, and less than ___ percent of their energy is converted to xrays.

Answer 10

99, 1

Question 11

while radiography and radiaiton therapy (in most cases) use ______ PET (which uses radioisotopes makes use of _______
(gamma rays? photons?)

Answer 11

photons, gamma rays

Question 12

the rotating anode is made of a transition metal with a high melting point. what element is the rotating anode made of?

Answer 12

tungsten

Question 13

above 70 kVp, ___% of the beam results from bremsstrahlung interactions, while ___% consists of characterisitic xrays.

Answer 13

85, 15

Question 14

explain the anode heel effect

Answer 14

xrays are more intense on the cathode side of the xray tube and the intensity decreases toward the anode