the number of x-ray reaching the film will be higher if the?

Question

1. mA setting is higher, the kVp setting is higher, and the atomic number making up the imaged structure is higher.

2. mA is higher, the kVp is lower, the patient imaged is thinner, and the distance between the tube and the film is decreased.

3. mA setting is higher, the kVp setting is higher, and the atomic number making up the imaged structure is lower.

4. mA setting is higher, the kVp setting is higher, the patient is thicker, and the tissue density is higher.

which one is correct? please help me out here. thanks in advance.

Answer 1

Answer 3.



The number of x-ray events is directly dependent on the mA setting - each electron will cause an x-ray quant as it is decelerated.



Higher kVp will make the x-rays more energetic, i.e. less likely to interact with light elements on their way to the film.



Low atomic number means that only softer radiation can be absorbed by the atom, creating less of a white shadow on the film.