The presence of noise on an image degrades its quality, particularly its
a. low-contrast resolution.
b. longitudinal resolution.
c. spatial resolution.
d. temporal resolution.
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a. low-contrast resolution.
Scanning to the adrenal glands in a CT study of the thorax is sometimes performed
because
a. it ensures that the technologist has scanned the entire lung field.
b. kidney function can be assessed.
c. the adrenal glands are part of the respiratory system.
d. lung cancer may metastasize to the adrenal glands.
,Give this one a try later!
d. lung cancer may metastasize to the adrenal glands.
Which is a TRUE statement regarding the risk of iodinated contrast media to the fetus?
a. At the usual clinical doses, iodinated contrast media does not cross the human
placenta and therefore will not enter the fetus.
b. Many studies have been done on the effects of iodinated contrast media in
pregnant women.
c. Although no definite risk to the fetus has been identified, not enough studies have
been done to conclude that there are no risks.
d. Fetal abnormalities have been reported in pregnant patients who were given
iodinated contrast media at the usual clinical doses.
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c. Although no definite risk to the fetus has been identified, not enough
studies have been done to conclude that there are no risks.
In a preliminary scout view of a patient, the abdomen is determined to be 360 mm in
length. In this four-slice CT system, the gantry makes a 360° rotation each second. The
protocol at this institution calls for a 5-mm slice thickness. To cover the entire
abdominal area in a single helical scan, which set of parameters could be selected?
a. 10-second total acquisition time, 1 pitch
b. 10-second total acquisition time, 1.2 pitch
c. 15-second total acquisition time, 1 pitch
d. 15-second total scan acquisition, 1.2 pitch
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, d. 15-second total scan acquisition, 1.2 pitch
Documentation of IV contrast administration is
a. only necessary when an adverse event occurs.
b. only necessary when routine injection parameters are modified.
c. required on all patients and must be cosigned by a radiologist.
d. required on all patients and should include the name of the agent, the dose, the
flow rate, and the injection site.
Give this one a try later!
d. required on all patients and should include the name of the agent, the
dose, the flow rate, and the injection site.
As a general rule, this is set at a point that has roughly the same value as the average
attenuation number of the tissue of interest. What is it?
a. The x axis in a histogram
b. Standard deviation
c. Sampling rate
d. Window level
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d. Window level
3D printing in CT uses what type of data sets?
a. MPR
b. Localizer image
, c. Volume rendered
d. Surface rendered
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c. Volume rendered
Which of the following is TRUE concerning CT dose uniformity?
a. Uniformity of dose increases as the scan field of view and patient thickness
increase.
b. The dose in body scans is more uniform than that of head scans.
c. The peripheral dose, or skin dose, of a body scan can be two to three times higher
than the central dose.
d. Compared with children, adults can be expected to receive a more uniform dose.
Give this one a try later!
c. The peripheral dose, or skin dose, of a body scan can be two to three
times higher than the central dose.
Refer to Figure 24-15. Name the structure indicated by arrow #3.
a. Talus
b. Cuneiform (interomedial or second)
c. Navicular bone
d. Metatarsal bone
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b. Cuneiform (interomedial or second)
a. low-contrast resolution.
b. longitudinal resolution.
c. spatial resolution.
d. temporal resolution.
Give this one a try later!
a. low-contrast resolution.
Scanning to the adrenal glands in a CT study of the thorax is sometimes performed
because
a. it ensures that the technologist has scanned the entire lung field.
b. kidney function can be assessed.
c. the adrenal glands are part of the respiratory system.
d. lung cancer may metastasize to the adrenal glands.
,Give this one a try later!
d. lung cancer may metastasize to the adrenal glands.
Which is a TRUE statement regarding the risk of iodinated contrast media to the fetus?
a. At the usual clinical doses, iodinated contrast media does not cross the human
placenta and therefore will not enter the fetus.
b. Many studies have been done on the effects of iodinated contrast media in
pregnant women.
c. Although no definite risk to the fetus has been identified, not enough studies have
been done to conclude that there are no risks.
d. Fetal abnormalities have been reported in pregnant patients who were given
iodinated contrast media at the usual clinical doses.
Give this one a try later!
c. Although no definite risk to the fetus has been identified, not enough
studies have been done to conclude that there are no risks.
In a preliminary scout view of a patient, the abdomen is determined to be 360 mm in
length. In this four-slice CT system, the gantry makes a 360° rotation each second. The
protocol at this institution calls for a 5-mm slice thickness. To cover the entire
abdominal area in a single helical scan, which set of parameters could be selected?
a. 10-second total acquisition time, 1 pitch
b. 10-second total acquisition time, 1.2 pitch
c. 15-second total acquisition time, 1 pitch
d. 15-second total scan acquisition, 1.2 pitch
Give this one a try later!
, d. 15-second total scan acquisition, 1.2 pitch
Documentation of IV contrast administration is
a. only necessary when an adverse event occurs.
b. only necessary when routine injection parameters are modified.
c. required on all patients and must be cosigned by a radiologist.
d. required on all patients and should include the name of the agent, the dose, the
flow rate, and the injection site.
Give this one a try later!
d. required on all patients and should include the name of the agent, the
dose, the flow rate, and the injection site.
As a general rule, this is set at a point that has roughly the same value as the average
attenuation number of the tissue of interest. What is it?
a. The x axis in a histogram
b. Standard deviation
c. Sampling rate
d. Window level
Give this one a try later!
d. Window level
3D printing in CT uses what type of data sets?
a. MPR
b. Localizer image
, c. Volume rendered
d. Surface rendered
Give this one a try later!
c. Volume rendered
Which of the following is TRUE concerning CT dose uniformity?
a. Uniformity of dose increases as the scan field of view and patient thickness
increase.
b. The dose in body scans is more uniform than that of head scans.
c. The peripheral dose, or skin dose, of a body scan can be two to three times higher
than the central dose.
d. Compared with children, adults can be expected to receive a more uniform dose.
Give this one a try later!
c. The peripheral dose, or skin dose, of a body scan can be two to three
times higher than the central dose.
Refer to Figure 24-15. Name the structure indicated by arrow #3.
a. Talus
b. Cuneiform (interomedial or second)
c. Navicular bone
d. Metatarsal bone
Give this one a try later!
b. Cuneiform (interomedial or second)
