Computed Tomography- Test 1 Questions with
Accurate Answers
1971 The EMI Mark 1 correct answer (CT brain scanner prototype) was installed at
Atkinson-Morley's Hospital under the direction of radiologist, Dr. James Ambrose.
1972 correct answer A woman with a suspected brain lesion was the first patient
scanned. The scanner confirmed the presence of the lesion.
2 elements in a basic scheme for data acquisition are: correct answer beam
geometry & components
3 types of acquisition geometries correct answer 1. parallel beam
2. fan beam
3. spiral beam
Advantages of Volume Scanning correct answer -multiplanar reconstruction
allows the data to be more accurately reconstructed in alternative planes. (ex.
coronal, sagittal, 3-D)
-shorter scan times as a result of the patient movement through the gantry
-more coverage in a single breath-hold
-gapless slices
-less contrast material needed
, -includes most exams of the chest, abdomen, and pelvis
-artifacts reduced due to less patient movement
Allan Cormack correct answer Physics Professor at Tufts University, developed the
mathematics used to reconstruct CT images (algorithms)
Basic Method for Data Acquisition correct answer -tube & detector scan the
patient for data
-beam is shaped by a special filter as it leaves the tube
-beam is collimated to pass through slice of interest
-beam is attenuated by patient & transmitted photons are then measured by
detector
-detector converts x-ray photons into an electrical signal (analog data)
-converter changes analog to digital
-digital data is sent to computer for image reconstruction
-ray is the part of the beam that falls on 1 detector
Accurate Answers
1971 The EMI Mark 1 correct answer (CT brain scanner prototype) was installed at
Atkinson-Morley's Hospital under the direction of radiologist, Dr. James Ambrose.
1972 correct answer A woman with a suspected brain lesion was the first patient
scanned. The scanner confirmed the presence of the lesion.
2 elements in a basic scheme for data acquisition are: correct answer beam
geometry & components
3 types of acquisition geometries correct answer 1. parallel beam
2. fan beam
3. spiral beam
Advantages of Volume Scanning correct answer -multiplanar reconstruction
allows the data to be more accurately reconstructed in alternative planes. (ex.
coronal, sagittal, 3-D)
-shorter scan times as a result of the patient movement through the gantry
-more coverage in a single breath-hold
-gapless slices
-less contrast material needed
, -includes most exams of the chest, abdomen, and pelvis
-artifacts reduced due to less patient movement
Allan Cormack correct answer Physics Professor at Tufts University, developed the
mathematics used to reconstruct CT images (algorithms)
Basic Method for Data Acquisition correct answer -tube & detector scan the
patient for data
-beam is shaped by a special filter as it leaves the tube
-beam is collimated to pass through slice of interest
-beam is attenuated by patient & transmitted photons are then measured by
detector
-detector converts x-ray photons into an electrical signal (analog data)
-converter changes analog to digital
-digital data is sent to computer for image reconstruction
-ray is the part of the beam that falls on 1 detector
