Exam 34: Exposure Conversion Problems

You are asked to fill in for a technologist at a local clinic for the day.When you arrive, you notice the x-ray generator is single phase.Your experience with exposure techniques was based upon a high frequency unit at the local hospital.To work at this clinic, you will likely do what to your hospital exposure techniques?

A radiograph is produced at 10 mAs with a three-phase, high frequency generator.The film is repeated using a single phase,2-pulse generator.Calculate the new mAs.

A radiograph is produced at 10 mAs with a single-phase, 2-pulse generator.The film is repeated using a three-phase, high frequency generator.Calculate the new mAs.

A radiograph is produced using 20 mAs, 85 kVp, and an 8:1 grid (GCF = 4).Calculate the new mAs if a 12:1 grid (GCF = 5.5) is used.

A satisfactory radiograph is produced using the variable kVp theory.The part measuring 8 cm and 55 kVp was used.To maintain exposure, what kVp should be used if the part measures 10 cm?

Match the following choices with the statements as each relates to exposure conversions. -requires less mAs but does not affect recorded detail or distortion

A satisfactory radiograph is produced as follows: 1 $\phi$ 2p, 70 kVp, 30 mAs, 40 in.SID, 8:1 grid, 200 RS.A new radiograph is to be produced with the following changes: high frequency, 12:1 grid, and 400 RS.What changes should be made to maintain the original exposure?

A radiograph is produced using 15 mAs and an image receptor with an RS of 200.Calculate the new mAs if an image receptor of 400 RS is used.

An acceptable radiographic image is taken under the following conditions: single phase-2p, 400 mA, 75 ms, 1.2 mm fs, 82 kVp, 44" SID, 400 RS receptor, 8:1 grid. What change would need to take place with the exposure conditions below, in order to maintain image quality? HF generator, 1.0 mm fs, 94 kVp, 44" SID, 300 RS receptor, 12:1 grid

A radiograph is produced using 10 mAs at a 40 in.distance.Calculate the new distance if 25 mAs is used.

Match the following choices with the statements as each relates to exposure conversions. -reduce kVp from 94 to 84 with mAs compensation

For a 20 cm part thickness, which of the following would accommodate a 6 cm increase in part thickness and maintain radiographic density?

A radiograph is produced using 70 kVp and 10 mAs.If kVp is increased to 80, how much mAs is required to maintain exposure?

Match the following choices with the statements as each relates to exposure conversions. -5 cm increase in tissue thickness

Match the following choices with the statements as each relates to exposure conversions. -switch from 400 RS to 300RS with no compensation

An exposure was made using 200 mA, 0.05 second exposure and 75 kVp.Each of the following changes will function to double radiographic image density, EXCEPT:

A radiograph is produced at 10 mAs with a single-phase power source and high frequency generator.The film is repeated using a single-phase, 2-pulse generator.Calculate the new mAs.

A particular radiograph was produced using 8 mAs and 84 kVp with an 8:1 ratio grid. The film is to be repeated using a 16:1 ratio grid. What should be the new mAs?

A satisfactory radiograph is produced using the variable kVp theory.The part measuring 10 cm and 65 kVp was used.To maintain exposure, what kVp should be used if the part measures 14 cm?

A radiograph is produced using 70 kVp and 10 mAs.If mAs is decreased to 5, how much kVp is required to maintain exposure?