Plese type the answers
1. In mammographic examinations, the breast is compressed between two plates. Answer the following with a brief explanation.
a. Is the geometric unsharpness (blurring) increased or decreased by compression?
b. Why is the image contrast improved by this procedure?
c. Is the required x-ray dose for a given image signal-to-noise ratio (SNR) higher or lower with compression?
2. Two X-ray images of the hand are shown in Figure 2.39. One corresponds to an x-ray beam with an effective energy of 140 keV and the other to an effective energy of 50 keV. Explain which is which, and the reasons for the difference in image contrast and signal intensity.
3. Planar x-ray images of a horseâs leg are shown in Figure 2.40. In (a), the kVp and tube current (mA) are chosen to give high contrast between the bone and surrounding tissue. Explain how the kVp and mA settings would have to be changed (increased, decreased, remain constant) to give the images shown in (b) and (c).
4. An acceptable abdominal radiograph can be obtained with technique factors of (1) 74 kvP, 120 mAs or (2) 82 kvP, 80 mAs. Discuss the reasons for selecting one technique over the other.
5. A dedicated chest imaging system is designed to use radiographic film of size 14 x 17 in (35 x 43 cm). If the source-to-imager distance (SID) is 180 cm and the source-to-diaphragm distance (SDD) is 10 cm, what diaphragm opening will allow an unexposed border of 1 cm around the film?
Plese type the answers
1. In mammographic examinations, the breast is compressed between two plates. Answer the following with a brief explanation.
a. Is the geometric unsharpness (blurring) increased or decreased by compression?
b. Why is the image contrast improved by this procedure?
c. Is the required x-ray dose for a given image signal-to-noise ratio (SNR) higher or lower with compression?
2. Two X-ray images of the hand are shown in Figure 2.39. One corresponds to an x-ray beam with an effective energy of 140 keV and the other to an effective energy of 50 keV. Explain which is which, and the reasons for the difference in image contrast and signal intensity.
3. Planar x-ray images of a horseâs leg are shown in Figure 2.40. In (a), the kVp and tube current (mA) are chosen to give high contrast between the bone and surrounding tissue. Explain how the kVp and mA settings would have to be changed (increased, decreased, remain constant) to give the images shown in (b) and (c).
4. An acceptable abdominal radiograph can be obtained with technique factors of (1) 74 kvP, 120 mAs or (2) 82 kvP, 80 mAs. Discuss the reasons for selecting one technique over the other.
5. A dedicated chest imaging system is designed to use radiographic film of size 14 x 17 in (35 x 43 cm). If the source-to-imager distance (SID) is 180 cm and the source-to-diaphragm distance (SDD) is 10 cm, what diaphragm opening will allow an unexposed border of 1 cm around the film?
