01 - CT Basics: Fundamentals Questions with
Accurate Answers
"Helical" refers to the type of scanning that occurs when the x-ray tube rotates
around the patient as the table transports the patient through the gantry
opening.
A) True
B) False correct answer True
"Spiral" or "Helical" Scanner correct answer Terms used to refer to* 6th
generation scanners* because of the geometry of the x-ray tube motion in
relation to the anatomy of interest.
*Fifth generation* CT scanners are specifically designed for *cardiac imaging*.
A) True
B) False correct answer True
*Filters* are used to* transfer power to the gantry components *and relay image
data to the computer.
A) True
B) False correct answer False - Slip rings
2D CT correct answer Standard output images in the *axial*, *coronal*, or*
sagittal planes* often used to create a care plan for a patient.
3D CT correct answer Process of displaying* volumetrically acquired CT data*
with a perception of 3D depth on a computer monitor or recording film; imaging
,used to compliment 2D images that would be used in creating a care plan for a
patient.
a tomographic principle in which the anatomic structure moves but the IR/Tube
remain stationary is called correct answer The process of using *motion to blur
*certain portions of the patients anatomy in order to *demonstrate a* particular*
area of interest*.
Adaptive Arrays correct answer Systems with *detector *elements that are *not
all the same size*.
Algorithm correct answer A* step-by-step mathematical procedure* used by a CT
processing computer that can manipulate collected data to achieve a desired
appearance of digital imaging.
Allan MacLeod Cormack correct answer Physics professor from South Africa who
*answered mathematical problems related to early CT algorithms *even before
CT scanners were invented.
Americium (Am) correct answer *Radiation source* used in the *first primitive CT
scanner*, which took 9 days to scan an object and 2 hours to reconstruct an
image.
Aperture correct answer *Opening of the gantry *in which the patient is
positioned during the scanning procedure, typically ranging from 70-78 cm in
diameter.
Array Processor correct answer Component of the CT computer system
responsible for* receiving raw scan data after it undergoes analog-to-digital
, conversion*, performing all of the *major post-processing *of the CT image, and
*returning the reconstructed image to the storage memory *of the host
computer.
Atkinson-Morley's Hospital correct answer • 1971: *First CT *installed and used
to* image a living human *.
• 1972: First clinical images were acquired with the first CT scanner
Axial Tomography correct answer Also known as "*conventional tomography*";
the plane of the* image is parallel to the long axis* of the body. The* X-ray tube
and the image receptor* move* along the long axis* of the patient.
• Patients laying on their* back* = *coronal* sections (front and back).
• Patients laying on their* side* = *sagittal* sections (left and right)
• Patient* standing* on top of table = *transverse* sections, however, this is not
a practical solution.
Axial/Transaxial correct answer Refers to *first CT scanner generations*; Limiting
terms that are no longer used because they do not describe the capabilities of
newer CT scanners.
Beam Geometry correct answer • The *size*,* shape*, and *motion* of the *x-
ray beam *emanating from the x-ray tube and passing through the patient to
strike a set of detectors that collects radiation attenuation data.
•• Important because it affects speed, quality and image reconstructions
algorithms during the acquisition process.
• 3 *types*:
•• *Pencil* Beam
•• *Fan* Beam
Accurate Answers
"Helical" refers to the type of scanning that occurs when the x-ray tube rotates
around the patient as the table transports the patient through the gantry
opening.
A) True
B) False correct answer True
"Spiral" or "Helical" Scanner correct answer Terms used to refer to* 6th
generation scanners* because of the geometry of the x-ray tube motion in
relation to the anatomy of interest.
*Fifth generation* CT scanners are specifically designed for *cardiac imaging*.
A) True
B) False correct answer True
*Filters* are used to* transfer power to the gantry components *and relay image
data to the computer.
A) True
B) False correct answer False - Slip rings
2D CT correct answer Standard output images in the *axial*, *coronal*, or*
sagittal planes* often used to create a care plan for a patient.
3D CT correct answer Process of displaying* volumetrically acquired CT data*
with a perception of 3D depth on a computer monitor or recording film; imaging
,used to compliment 2D images that would be used in creating a care plan for a
patient.
a tomographic principle in which the anatomic structure moves but the IR/Tube
remain stationary is called correct answer The process of using *motion to blur
*certain portions of the patients anatomy in order to *demonstrate a* particular*
area of interest*.
Adaptive Arrays correct answer Systems with *detector *elements that are *not
all the same size*.
Algorithm correct answer A* step-by-step mathematical procedure* used by a CT
processing computer that can manipulate collected data to achieve a desired
appearance of digital imaging.
Allan MacLeod Cormack correct answer Physics professor from South Africa who
*answered mathematical problems related to early CT algorithms *even before
CT scanners were invented.
Americium (Am) correct answer *Radiation source* used in the *first primitive CT
scanner*, which took 9 days to scan an object and 2 hours to reconstruct an
image.
Aperture correct answer *Opening of the gantry *in which the patient is
positioned during the scanning procedure, typically ranging from 70-78 cm in
diameter.
Array Processor correct answer Component of the CT computer system
responsible for* receiving raw scan data after it undergoes analog-to-digital
, conversion*, performing all of the *major post-processing *of the CT image, and
*returning the reconstructed image to the storage memory *of the host
computer.
Atkinson-Morley's Hospital correct answer • 1971: *First CT *installed and used
to* image a living human *.
• 1972: First clinical images were acquired with the first CT scanner
Axial Tomography correct answer Also known as "*conventional tomography*";
the plane of the* image is parallel to the long axis* of the body. The* X-ray tube
and the image receptor* move* along the long axis* of the patient.
• Patients laying on their* back* = *coronal* sections (front and back).
• Patients laying on their* side* = *sagittal* sections (left and right)
• Patient* standing* on top of table = *transverse* sections, however, this is not
a practical solution.
Axial/Transaxial correct answer Refers to *first CT scanner generations*; Limiting
terms that are no longer used because they do not describe the capabilities of
newer CT scanners.
Beam Geometry correct answer • The *size*,* shape*, and *motion* of the *x-
ray beam *emanating from the x-ray tube and passing through the patient to
strike a set of detectors that collects radiation attenuation data.
•• Important because it affects speed, quality and image reconstructions
algorithms during the acquisition process.
• 3 *types*:
•• *Pencil* Beam
•• *Fan* Beam
