Computed Tomography Exam 2025
Questions and Answers
Who is Radon? - ANSWER✔✔-in 1917 he develops reconstruction mathematics (two dimensional
/ three dimensional
Who is Watson? - ANSWER✔✔-Developed another tomographic technique in which the sections
were transverse (Cross Sectional) "transverse axial tomography
Who is Godfrey Housfield? - ANSWER✔✔-he applied reconstruction technique to produce the 1st
clinically useful ct scanner
He called the technique "Computerized Transverse Axial Scanning"
Describe the first clinical scanner - ANSWER✔✔-1971
Brain scanner was installed at Atkins-Morley's Hospital.
Initially took 20 minutes processing time.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Only 4.5 minutes with the introduction of minicomputers.
Who is Allan Cormack? - ANSWER✔✔-Cormack developed the mathematical formulas for
processing data.
Cormack developed the mathematical formulas for processing data.
What does CT? - ANSWER✔✔-Computed Tomography
How are images obtained? - ANSWER✔✔-1. X-ray passes through a patient and is attenuated
differently by the various organs.
2. The remnant x-rays are then measured by the detectors.
3. The detectors send info to the computer.
4. The computer performs the image reconstruction.
5. The images are displayed on the television monitor for viewing.
6. The image is stored or recorded on film.
What are advantages of CT over Conventional Radiography - ANSWER✔✔-Better contrast
resolution
No superimposition of tissue
Less Scatter radiation
3D imaging
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, Bone mineral assay (bone analysis)
What are clinical uses of CT? - ANSWER✔✔-● General Diagnosis
● Disease Staging
● Trauma Surveys
● Pre-Operative Planning (Biopsies, Drainages, pain management)
● Invasive Procedures
● Bone Densitometry
● Cerebral Blood flow Studies
FIRST GENERATION
What does it image
what kind of geometry does 1st generation have?
How long does 1 scan take?
How many detectors does it have?
How many degrees does it move? - ANSWER✔✔-HEAD only
Translate-rotate motion Pencil Beam
4.5-5 mins
1 or 2 detectors
1 degree until 180 degrees
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
Questions and Answers
Who is Radon? - ANSWER✔✔-in 1917 he develops reconstruction mathematics (two dimensional
/ three dimensional
Who is Watson? - ANSWER✔✔-Developed another tomographic technique in which the sections
were transverse (Cross Sectional) "transverse axial tomography
Who is Godfrey Housfield? - ANSWER✔✔-he applied reconstruction technique to produce the 1st
clinically useful ct scanner
He called the technique "Computerized Transverse Axial Scanning"
Describe the first clinical scanner - ANSWER✔✔-1971
Brain scanner was installed at Atkins-Morley's Hospital.
Initially took 20 minutes processing time.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Only 4.5 minutes with the introduction of minicomputers.
Who is Allan Cormack? - ANSWER✔✔-Cormack developed the mathematical formulas for
processing data.
Cormack developed the mathematical formulas for processing data.
What does CT? - ANSWER✔✔-Computed Tomography
How are images obtained? - ANSWER✔✔-1. X-ray passes through a patient and is attenuated
differently by the various organs.
2. The remnant x-rays are then measured by the detectors.
3. The detectors send info to the computer.
4. The computer performs the image reconstruction.
5. The images are displayed on the television monitor for viewing.
6. The image is stored or recorded on film.
What are advantages of CT over Conventional Radiography - ANSWER✔✔-Better contrast
resolution
No superimposition of tissue
Less Scatter radiation
3D imaging
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, Bone mineral assay (bone analysis)
What are clinical uses of CT? - ANSWER✔✔-● General Diagnosis
● Disease Staging
● Trauma Surveys
● Pre-Operative Planning (Biopsies, Drainages, pain management)
● Invasive Procedures
● Bone Densitometry
● Cerebral Blood flow Studies
FIRST GENERATION
What does it image
what kind of geometry does 1st generation have?
How long does 1 scan take?
How many detectors does it have?
How many degrees does it move? - ANSWER✔✔-HEAD only
Translate-rotate motion Pencil Beam
4.5-5 mins
1 or 2 detectors
1 degree until 180 degrees
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
