ct final exam study guide questions with correct
answers
What three limitations of conventional radiography lead to the invention of tomography - VERIFIED
ANSWER✔✔-1. superimposed anatomic structures on the two-dimensional film image
2. not quantatitative
3. inferior contrast resolution
__ uses motion of the x-ray tube and the image receptor to blur out structures above and below the anatomic
structure or region of interest - VERIFIED ANSWER✔✔-tomography
computed tomography overcomes the limitations in detail and clarity found in radiography and tomography by
using ___- - VERIFIED ANSWER✔✔-image reconstruction from projection (computers)
emission ct is different from transmission ct in that (3 ways) - VERIFIED ANSWER✔✔-1. it views the function
of the body instead of anatomy
2. it receives emissions from radioactive agents that have been introduced into the patient's body
3. it uses a gamma camera/coicidence detector instead of x-ray tubes
what type of ct scanner is used to view the pateint's anatomy, uses an xray tube that travels around the patient in
gantry and pulses on and off and transmitted xrays are detected. the computer reconstructs the data to produce
cross-sectional images of the body and image reconstructions - VERIFIED ANSWER✔✔-transmission ct
the current and most appropriate term for the modality discussed in this course is - VERIFIED ANSWER✔✔-
computed tomography (ct
what order does the CT process - VERIFIED ANSWER✔✔-1. image process
2. image display, manipulation, storage, recording, and communication
3. data acquisition
an example of emission ct is - VERIFIED ANSWER✔✔-SPECT
the first clinically useful CT scanner was produced by - VERIFIED ANSWER✔✔-sir dr. godfrey hounsfield
what generation has a pencil beam and a single detector - VERIFIED ANSWER✔✔-first
which type of ct has two sources (beams) - VERIFIED ANSWER✔✔-dual source
the different "advancements" in the methods of scanning in CT units over the years are referred to as - VERIFIED
ANSWER✔✔-generations
most ct unites used today are variation of what type of generation - VERIFIED ANSWER✔✔-third
a technique in which a volume of tissue is scanned by moving the patient continuously through the gantry of the
scanner while the x-ray tube and detectors rotate continuously for several rotations is known as - VERIFIED
ANSWER✔✔-spiral, helical, and volume scanning
what are the 4 benefits of ct over radiography? - VERIFIED ANSWER✔✔-1. ability to manipulate attentuation
data
2. ability to create multi-planar recontructions (MPRs)
3. ct has increased contrast resolution
4. anatomic structures are visualized withouth superinposition
HL7 - VERIFIED ANSWER✔✔-communication protocol for text
, DICOM - VERIFIED ANSWER✔✔-communication protocol for images
RAM - VERIFIED ANSWER✔✔-temporary storage for programming and operating instructions
bit - VERIFIED ANSWER✔✔-binary digit
bus - VERIFIED ANSWER✔✔-conductors that connect CPU to other parts of the computer
CPU - VERIFIED ANSWER✔✔-"heart of the computer" that directs information to and from various parts of the
computer
byte - VERIFIED ANSWER✔✔-8 bits
HIS - VERIFIED ANSWER✔✔-information system used in hospital for all patient information, EMR, address
biling, medical records, etc.
RIS - VERIFIED ANSWER✔✔-information system used radiology department for obtaining patient information,
charging, supplies, etc.
u - VERIFIED ANSWER✔✔-attenuation coefficient
what are the 3 examples of an input hardware device - VERIFIED ANSWER✔✔-1. capiler measurement tool in
sonography
2. RIO measurement in CT
3. touch screen monitor at the control panel
what is a device that changes discrete data to continuous information - VERIFIED ANSWER✔✔-digital to
analog converter
an image displayed on a monitor is known as a __ display - VERIFIED ANSWER✔✔-soft copy
a device that changes continuous data to discrete data is known as - VERIFIED ANSWER✔✔-analog to digital
converter
a network of computers in a hospital, building, or in a similar location is known as - VERIFIED ANSWER✔✔-
local area network (LAN)
you have an external hard drive that can hold two tera-bytes of data. how many bits does it hold? - VERIFIED
ANSWER✔✔-16,000,000,000,000 (8x2) tera=trillions=12
what has the best number of gray level color output for analog to digital converter - VERIFIED ANSWER✔✔-3
bits (the most bits)
secondary storage refers to - VERIFIED ANSWER✔✔-magnetic tapes, magenetic disks, opital disks
secondary storage does not refer to - VERIFIED ANSWER✔✔-read only memory (ROM)
the electrical signal that leaves the detector is __ information - VERIFIED ANSWER✔✔-analog
a mathematical formula that changes that data is known as an - VERIFIED ANSWER✔✔-algorithm
which ct components are found inside the ct gantry (3) - VERIFIED ANSWER✔✔-x-ray tube, detector array,
collimators
how does bone appear on a ct image - VERIFIED ANSWER✔✔-it depends on the window width and level
as compared to a standard ct image, an image with smaller pixels will have - VERIFIED ANSWER✔✔-increased
spatial resoluation
answers
What three limitations of conventional radiography lead to the invention of tomography - VERIFIED
ANSWER✔✔-1. superimposed anatomic structures on the two-dimensional film image
2. not quantatitative
3. inferior contrast resolution
__ uses motion of the x-ray tube and the image receptor to blur out structures above and below the anatomic
structure or region of interest - VERIFIED ANSWER✔✔-tomography
computed tomography overcomes the limitations in detail and clarity found in radiography and tomography by
using ___- - VERIFIED ANSWER✔✔-image reconstruction from projection (computers)
emission ct is different from transmission ct in that (3 ways) - VERIFIED ANSWER✔✔-1. it views the function
of the body instead of anatomy
2. it receives emissions from radioactive agents that have been introduced into the patient's body
3. it uses a gamma camera/coicidence detector instead of x-ray tubes
what type of ct scanner is used to view the pateint's anatomy, uses an xray tube that travels around the patient in
gantry and pulses on and off and transmitted xrays are detected. the computer reconstructs the data to produce
cross-sectional images of the body and image reconstructions - VERIFIED ANSWER✔✔-transmission ct
the current and most appropriate term for the modality discussed in this course is - VERIFIED ANSWER✔✔-
computed tomography (ct
what order does the CT process - VERIFIED ANSWER✔✔-1. image process
2. image display, manipulation, storage, recording, and communication
3. data acquisition
an example of emission ct is - VERIFIED ANSWER✔✔-SPECT
the first clinically useful CT scanner was produced by - VERIFIED ANSWER✔✔-sir dr. godfrey hounsfield
what generation has a pencil beam and a single detector - VERIFIED ANSWER✔✔-first
which type of ct has two sources (beams) - VERIFIED ANSWER✔✔-dual source
the different "advancements" in the methods of scanning in CT units over the years are referred to as - VERIFIED
ANSWER✔✔-generations
most ct unites used today are variation of what type of generation - VERIFIED ANSWER✔✔-third
a technique in which a volume of tissue is scanned by moving the patient continuously through the gantry of the
scanner while the x-ray tube and detectors rotate continuously for several rotations is known as - VERIFIED
ANSWER✔✔-spiral, helical, and volume scanning
what are the 4 benefits of ct over radiography? - VERIFIED ANSWER✔✔-1. ability to manipulate attentuation
data
2. ability to create multi-planar recontructions (MPRs)
3. ct has increased contrast resolution
4. anatomic structures are visualized withouth superinposition
HL7 - VERIFIED ANSWER✔✔-communication protocol for text
, DICOM - VERIFIED ANSWER✔✔-communication protocol for images
RAM - VERIFIED ANSWER✔✔-temporary storage for programming and operating instructions
bit - VERIFIED ANSWER✔✔-binary digit
bus - VERIFIED ANSWER✔✔-conductors that connect CPU to other parts of the computer
CPU - VERIFIED ANSWER✔✔-"heart of the computer" that directs information to and from various parts of the
computer
byte - VERIFIED ANSWER✔✔-8 bits
HIS - VERIFIED ANSWER✔✔-information system used in hospital for all patient information, EMR, address
biling, medical records, etc.
RIS - VERIFIED ANSWER✔✔-information system used radiology department for obtaining patient information,
charging, supplies, etc.
u - VERIFIED ANSWER✔✔-attenuation coefficient
what are the 3 examples of an input hardware device - VERIFIED ANSWER✔✔-1. capiler measurement tool in
sonography
2. RIO measurement in CT
3. touch screen monitor at the control panel
what is a device that changes discrete data to continuous information - VERIFIED ANSWER✔✔-digital to
analog converter
an image displayed on a monitor is known as a __ display - VERIFIED ANSWER✔✔-soft copy
a device that changes continuous data to discrete data is known as - VERIFIED ANSWER✔✔-analog to digital
converter
a network of computers in a hospital, building, or in a similar location is known as - VERIFIED ANSWER✔✔-
local area network (LAN)
you have an external hard drive that can hold two tera-bytes of data. how many bits does it hold? - VERIFIED
ANSWER✔✔-16,000,000,000,000 (8x2) tera=trillions=12
what has the best number of gray level color output for analog to digital converter - VERIFIED ANSWER✔✔-3
bits (the most bits)
secondary storage refers to - VERIFIED ANSWER✔✔-magnetic tapes, magenetic disks, opital disks
secondary storage does not refer to - VERIFIED ANSWER✔✔-read only memory (ROM)
the electrical signal that leaves the detector is __ information - VERIFIED ANSWER✔✔-analog
a mathematical formula that changes that data is known as an - VERIFIED ANSWER✔✔-algorithm
which ct components are found inside the ct gantry (3) - VERIFIED ANSWER✔✔-x-ray tube, detector array,
collimators
how does bone appear on a ct image - VERIFIED ANSWER✔✔-it depends on the window width and level
as compared to a standard ct image, an image with smaller pixels will have - VERIFIED ANSWER✔✔-increased
spatial resoluation
