A Radiograph Taken During an Upper GI Series Demonstrates Poor

question 59

Multiple Choice

A radiograph taken during an upper GI series demonstrates poor visibility of the gastric mucosa.The following factors were used: 80 kV, 30 mAs, and 1/40-second exposure time.Barium sulfate was used during the procedure.Which of the following factors needs to be modified during the repeat exposure?

• A)Use of detail-speed screens (adjust mAs accordingly)
• B)Shortened exposure time (increase mAs accordingly)
• C)Use of a water-soluble contrast medium
• D)Increased kV (decrease mAs as needed)

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Definitions:

Diffusion

The passive movement of particles from an area of high concentration to an area of low concentration.

ATP

ATP, or adenosine triphosphate, is a high-energy molecule that stores and supplies the cell with needed energy for various biological processes through the transfer of a phosphate group.

Facilitated Diffusion

A method of passive transport, mediated by carrier proteins, that allows molecules to cross the cell membrane without energy input, from higher to lower concentration.