Lab 5+6

Question 1

T/F

If the same technical factors (mAs, kVp & SID) were used successively (one after the other) to make exposures, the radiation output should be similar each time and hence, reproducible.

Answer 1

True

Question 2

What equipment is needed for a Exposure (Radiation Output) Reproducibility test?

Answer 2

Dosimeter
X-ray source
Lead apron
Calculator

Question 3

Fill in the blank-SC35

For any combination of operating loading factors, the coefficient of variation of any ten consecutive radiation irradiation measurements, taken at the same source to detector distance within a time period of one hour, is no greater than ?, AND each of the ten irradiation measurements is within ? of the mean value of the ten measurements.

Answer 3

For any combination of operating loading factors, the coefficient of variation of any ten consecutive radiation irradiation measurements, taken at the same source to detector distance within a time period of one hour, is no greater than 0.05, AND each of the ten irradiation measurements is within 15% of the mean value of the ten measurements.

Question 4

Fill in the blank-HARP

For any combination of operating loading factors, the coefficient of variation of any ten consecutive radiation irradiation measurements, taken at the same source to detector distance within a time period of one hour, is no greater than ? AND each of the ten irradiation measurements is within ? of the mean value of the ten measurements.

Answer 4

For any combination of operating loading factors, the coefficient of variation of any ten consecutive radiation irradiation measurements, taken at the same source to detector distance within a time period of one hour, is no greater than 0.08, AND each of the ten irradiation measurements is within 20% of the mean value of the ten measurements.

Question 5

T/F

Since mAs is directly proportional to radiation output, a sequential increase in mAs will produce the same sequential increase in exposure measured.

Answer 5

True

Question 6

T/F

doubling the mAs will NOT double the radiation output.

Answer 6

False; doubling the mAs will double the radiation output.

Question 7

Describe mAs reciprocity

Answer 7

If the same mAs is being used for successive exposure with different combinations of mA and exposure time, the resulting radiation output should be the same, as long as all other factors are held constant.

Question 8

Fill in the blank

In order for the tests associated with exposure reproducibility, exposure linearity and mAs reciprocity to be accurate ? & ? accuracy must be tested first.

Answer 8

In order for the tests associated with exposure reproducibility, exposure linearity and mAs reciprocity to be accurate kVp & timer accuracy must be tested first.