CT EXAM|| 114 QUESTIONS AND
ANSWERS (GRADED A+)
Image produced is a transaxial or transverse that is perpendicular to the long axis of the
body - ANSWER-CT
The plane of the image is parallel to the long axis of the body - ANSWER-Axial
tomography
The part of the CT scanner that houses the x-ray tube, cooling system, detector
assembly, and data acquisition system (DAS) - ANSWER-Gantry
Related to the x-ray attenuation coefficient of the tissue contained in the voxel -
ANSWER-Hounsfield unit (HU)
When source detector assembly makes one sweep across the patient/internal structure
- ANSWER-Translation
Mathematical formula used to carry out complex calculations required for image
reconstruction - ANSWER-Algorithm
An arrangement of cells in rows and columns - ANSWER-Image matrix
The individual cells in an image matrix - ANSWER-Pixel
Tissue volume, the basic unit of a CT image Determined by multiplying the pixel size by
the thickness of the CT image slice - ANSWER-Voxel
Area of anatomy displayed by the Cathode Ray Tube (CRT) - ANSWER-FOV (Field of
View)
As the FOV of a fixed matrix size is increased, pixel size________________ -
ANSWER-increases proportionately
As matrix size increases for a fixed FOV, pixel size______________ - ANSWER-
decreases
Lies between arachnoid and pia mater; CSF circulates in this space. - ANSWER-
Subarachnoid
Composed of the midbrain, pons and medulla oblongata - ANSWER-Brainstem
Lies in the postero-inferior region of the cranium - ANSWER-Cerebellum
, largest ventricle, found in each cerebral hemisphere - ANSWER-Lateral ventricles
Supply the anterior structures of the brain - ANSWER-2 internal carotid arteries
Transverse the neck and enter the posterior skull by way of the foramen magnum -
ANSWER-2 vertebral arteries
Axial or transverse plane Should be viewed as if one is at the patient's
____________________ - ANSWER-feet and looking up toward the head
In Axial or transverse plane Patient's right is to the viewer's_______ - ANSWER-left
A longitudinal plane dividing the body into anterior and posterior portions - ANSWER-
Coronal
A longitudinal plane dividing the body into right and left portions - ANSWER-Sagittal
Bones and other dense material - ANSWER-white
Air and lower density material - ANSWER-black
Fat, muscle, and organs - ANSWER-various shades of gray
Bone has a value of - ANSWER-+150 or up to +1000
Dense bone has a value of - ANSWER-+1000 to + 3000
Air has a CT value of - ANSWER--1000
A longitudinal or transverse plane that is at an angle or slant and not parallel to the
sagittal, coronal or horizontal planes. - ANSWER-Oblique
Shades of gray are assigned CT numbers between those of - ANSWER-bone and air.
The brain is surrounded by three protective layers called ____________ - ANSWER-
meninges
The inner most protective layers of the Brain - ANSWER-Pia matter
The middle protective layers of the Brain - ANSWER-Arachnoid
The Outer most protective layer of the brain - ANSWER-Dura mater
prevents blood loss in the brain by a unique arterial anastomosis - ANSWER-Circle of
Willis
ANSWERS (GRADED A+)
Image produced is a transaxial or transverse that is perpendicular to the long axis of the
body - ANSWER-CT
The plane of the image is parallel to the long axis of the body - ANSWER-Axial
tomography
The part of the CT scanner that houses the x-ray tube, cooling system, detector
assembly, and data acquisition system (DAS) - ANSWER-Gantry
Related to the x-ray attenuation coefficient of the tissue contained in the voxel -
ANSWER-Hounsfield unit (HU)
When source detector assembly makes one sweep across the patient/internal structure
- ANSWER-Translation
Mathematical formula used to carry out complex calculations required for image
reconstruction - ANSWER-Algorithm
An arrangement of cells in rows and columns - ANSWER-Image matrix
The individual cells in an image matrix - ANSWER-Pixel
Tissue volume, the basic unit of a CT image Determined by multiplying the pixel size by
the thickness of the CT image slice - ANSWER-Voxel
Area of anatomy displayed by the Cathode Ray Tube (CRT) - ANSWER-FOV (Field of
View)
As the FOV of a fixed matrix size is increased, pixel size________________ -
ANSWER-increases proportionately
As matrix size increases for a fixed FOV, pixel size______________ - ANSWER-
decreases
Lies between arachnoid and pia mater; CSF circulates in this space. - ANSWER-
Subarachnoid
Composed of the midbrain, pons and medulla oblongata - ANSWER-Brainstem
Lies in the postero-inferior region of the cranium - ANSWER-Cerebellum
, largest ventricle, found in each cerebral hemisphere - ANSWER-Lateral ventricles
Supply the anterior structures of the brain - ANSWER-2 internal carotid arteries
Transverse the neck and enter the posterior skull by way of the foramen magnum -
ANSWER-2 vertebral arteries
Axial or transverse plane Should be viewed as if one is at the patient's
____________________ - ANSWER-feet and looking up toward the head
In Axial or transverse plane Patient's right is to the viewer's_______ - ANSWER-left
A longitudinal plane dividing the body into anterior and posterior portions - ANSWER-
Coronal
A longitudinal plane dividing the body into right and left portions - ANSWER-Sagittal
Bones and other dense material - ANSWER-white
Air and lower density material - ANSWER-black
Fat, muscle, and organs - ANSWER-various shades of gray
Bone has a value of - ANSWER-+150 or up to +1000
Dense bone has a value of - ANSWER-+1000 to + 3000
Air has a CT value of - ANSWER--1000
A longitudinal or transverse plane that is at an angle or slant and not parallel to the
sagittal, coronal or horizontal planes. - ANSWER-Oblique
Shades of gray are assigned CT numbers between those of - ANSWER-bone and air.
The brain is surrounded by three protective layers called ____________ - ANSWER-
meninges
The inner most protective layers of the Brain - ANSWER-Pia matter
The middle protective layers of the Brain - ANSWER-Arachnoid
The Outer most protective layer of the brain - ANSWER-Dura mater
prevents blood loss in the brain by a unique arterial anastomosis - ANSWER-Circle of
Willis
