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CTMR 403 Unit 1 Test With Complete Solution
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CTMR 403 Unit 1 Test WithComplete Solution
The Radiological Society of North America's established term for the radiographic
technique discovered by Hounsfield that produces an image of a detailed cross - section
of tissue is - Answer Computed Tomography CT
Derived from the Greek word " tomos " meaning section , tomography is an image of a
patient's section oriented _____ to the film - Answer parallel
• The major shortcoming of radiography is the ———- of all structures on the radiograph
makes it difficult to distinguish a particular detail - Answer superimposition
CT's goal is to overcome the previously mentioned limitations by Minimizing ———
Improving image ____ and Recording very small differences in subject contrast - Answer
Superimposition
Contrast
Discovered that measurements of x - rays passing through an object from all directions
could be formed into a 3d image - Answer Godfrey hounsfield
In ____ , his research resulted in the first clinically useful CT scanner when a women was
suspected with a brain lesion - Answer 1972
Developed solutions to the mathematical problems that plagued early CT development -
Answer Allan MacLeod Cormack
Developed the first whole - body CT scanner in 1974 - Answer Dr. Robert Ledley
In 1975 : ________ is installed for dynamic volume scanning at Mayo Clinic - Answer
Dynamic spatial reconstructor DSR )
What year? : First report of practical spiral CT scanner was presented at the
Radiological Society of North America ( RSNA ) meeting in Chicago - Answer 1989 :
In ——- : Multi - slice CT ( MSCT ) introduced at RSNA meeting - Answer 1998
Term used to refer to the method of scanning in computed tomography - Answer
generation
used to refer to x - ray beam geometry and method of scanning - Answer generation
CT Image Formation Process Three steps - Answer Data acquisition
, Image reconstruction
Image display and communication
Refers to the collection of x - ray transmission measurements from the patient - Answer
Data Acquisition
_______ _____ detectors measure the attenuation of the x - ray beam as it passes through
the patient - Answer Special electronic
The first CT scanners required the x - ray tube and detectors to move in - Answer a
straight line across the patient's head
More efficient schemes used today for patient scanning involve - Answer Volume
scanning
Spiral Helical
Types of Data Acquisition - Answer Slice by Slice
Volume Scanning
The x - ray tube rotates around the patient and collects data for the first slice The tube
stops , and the patient moves into position for the next slice The process is repeated
until all slices are acquired - Answer Slice by Slice
Technique developed to reduce the acquisition time of slice- by - slice scanning -
Answer Volume Scanning
A volume of tissue is scanned in a spiral or helical path as a result of the patient , x - ray
tube , and detectors continuously moving for several rotations - Answer Volume
Scanning
Volume Data Acquisition Referred to as - Answer spiral or helical scanning
Used to scan a volume of tissue rather than one slice at a time - Answer Volume Data
Acquisition
Single - slice CT ( SSCT Multislice CT ( MSCT )
MSCT Technology Improvements - Answer High - speed imaging
Large bore gantry apertures
Improved z axis resolution
Data collected by the detectors during the data acquisition process are sent to the
computer for processing - Answer Image Reconstruction
——— are vital to the reconstruction process , as special mathematical techniques
known as image reconstruction algorithms are applied to the data to produce an image -
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