CT Equipment Configuration
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Questions and Answers

What is the primary purpose of the imaging system in a CT scanner?

  • Display, record, and store the x-ray images
  • Produce x-rays and detect radiation passing through a defined cross-section (correct)
  • Maintain the computer system for data processing
  • Control the operation of the gantry components

    • Where is the computer system typically located in a CT scanner setup?

  • Scanner room
  • Operator's room
  • Computer room (correct)
  • Filter room

    • Which component is responsible for X-ray production in the imaging system of a CT scanner?

  • Detectors
  • Collimators
  • Filter
  • X-ray tube and generator (correct)

    • What role do collimators play in the imaging system of a CT scanner?

    <p>Defining slice thickness and restricting the X-ray beam to the cross-section of interest</p> Signup and view all the answers

    Which room houses the display, recording, and storage system in a CT scanner setup?

    <p>Operator's room</p> Signup and view all the answers

    What do detectors do in the imaging system of a CT scanner?

    <p>Detect and measure radiation passing through a defined cross-section</p> Signup and view all the answers

    Which component is responsible for ensuring beam uniformity at the detectors in a CT scanner?

    <p>Filter</p> Signup and view all the answers

    What is the primary purpose of the liquid-bearing technology used in the Straton X-ray tube?

    <p>All of the above</p> Signup and view all the answers

    What is the key advantage of the Straton X-ray tube's compact design?

    <p>It allows for faster gantry rotation</p> Signup and view all the answers

    What is the significance of the Straton X-ray tube's electron beam being deflected to strike the anode at two precisely located focal spots?

    <p>It allows for the creation of two separate X-ray beams that pass through the patient</p> Signup and view all the answers

    What is the significance of the Straton X-ray tube being encased in a protective housing that contains oil for cooling?

    <p>It enables the anode to be in direct contact with the circulating oil, resulting in very high cooling rates</p> Signup and view all the answers

    What is the primary reason for the increased cooling rates in the Straton X-ray tube compared to conventional X-ray tubes?

    <p>The direct contact of the anode with the circulating oil</p> Signup and view all the answers

    What is the significance of the Straton X-ray tube's ability to be used in high kV and high mA techniques for prolonged durations?

    <p>It enables high-speed volume scanning</p> Signup and view all the answers

    What is a key factor that determines the radiation source requirement in CT?

    <p>The atomic number and density of the absorber</p> Signup and view all the answers

    Why have rotating anode X-ray tubes become common in CT?

    <p>To achieve higher power levels for continuous rotation scanners</p> Signup and view all the answers

    What material is commonly used in the disk of rotating anode X-ray tubes to meet spatial resolution requirements?

    <p>Tungsten</p> Signup and view all the answers

    Why are metal envelope tubes preferred over glass envelope tubes in x-ray tubes?

    <p>To prevent electrical arcing from tungsten deposits</p> Signup and view all the answers

    What is a key feature of the cathode assembly in x-ray tubes?

    <p>Use of tungsten-rhenium filaments</p> Signup and view all the answers

    What type of anode disk design is mostly used in tubes for spiral/helical CT scanning?

    <p>Brazed graphite disk</p> Signup and view all the answers

    What is the purpose of the bearing assembly in x-ray tubes?

    <p>To ensure smooth rotation of the anode disk</p> Signup and view all the answers

    What type of liquid is used in the liquid-bearing method to improve rotation in modern CT?

    <p>Gallium-based liquid metal alloy</p> Signup and view all the answers

    What feature allows metal envelope tubes to use higher tube currents compared to conventional tubes?

    <p>Larger anode disks</p> Signup and view all the answers

    How do brazed graphite disks increase heat-storage capacity compared to all-metal disks?

    <p>By brazing tungsten-rhenium to a graphite base body</p> Signup and view all the answers

    What is the function of the internal laser in a CT scanner?

    <p>To mark the patient during scanning and treatment</p> Signup and view all the answers

    What is the purpose of the high-frequency generator in a CT scanner?

    <p>To convert low-voltage, low-frequency current to high-voltage, high-frequency current</p> Signup and view all the answers

    What is the main function of the gantry in a CT scanner?

    <p>To rotate and surround the patient in a vertical plane</p> Signup and view all the answers

    Which component helps to identify the scan plane in a CT scanner?

    <p>Internal laser</p> Signup and view all the answers

    What is the purpose of the wall-mounted laser in a CT scanner?

    <p>Aligning the patient</p> Signup and view all the answers

    Why do most scanners have a 70-cm aperture according to the text?

    <p>Facilitate easy access to patients in emergencies</p> Signup and view all the answers

    What does the gantry tilting range refer to in a CT scanner?

    <p>The degree of tilt between systems to accommodate patients</p> Signup and view all the answers

    Where is the high-frequency generator located in most modern CT scanners?

    <p>In a corner of the gantry and does not rotate with the tube</p> Signup and view all the answers

    Study Notes

    CT Scanner Components and Functions

    • The primary purpose of the imaging system in a CT scanner is to produce images.
    • The computer system is typically located in a separate room, which houses the display, recording, and storage system.

    X-ray Production and Beam Uniformity

    • The X-ray tube is responsible for X-ray production in the imaging system of a CT scanner.
    • Collimators play a role in shaping the X-ray beam.
    • The X-ray tube's beam uniformity is ensured by the X-ray beam filter.

    Detector Functions

    • Detectors convert X-ray signals into electrical signals.

    Straton X-ray Tube

    • The primary purpose of the liquid-bearing technology used in the Straton X-ray tube is to improve cooling rates.
    • The Straton X-ray tube's compact design allows for a smaller footprint and increased portability.
    • The electron beam is deflected to strike the anode at two precisely located focal spots, ensuring beam uniformity.
    • The Straton X-ray tube is encased in a protective housing that contains oil for cooling, allowing for increased cooling rates.
    • The Straton X-ray tube can be used in high kV and high mA techniques for prolonged durations due to its efficient cooling.

    Radiation Source Requirements

    • The radiation source requirement in CT is determined by the type of examination and the patient's size.

    Rotating Anode X-ray Tubes

    • Rotating anode X-ray tubes have become common in CT due to their high heat capacity and ability to handle high X-ray tube currents.
    • Molybdenum is commonly used in the disk of rotating anode X-ray tubes to meet spatial resolution requirements.
    • Metal envelope tubes are preferred over glass envelope tubes in X-ray tubes due to their strength and durability.

    Cathode Assembly and Anode Disk Design

    • A key feature of the cathode assembly in X-ray tubes is its ability to produce a high-intensity electron beam.
    • The spiral/helical anode disk design is mostly used in tubes for spiral/helical CT scanning.

    Bearing Assembly and Liquid-Bearing Method

    • The bearing assembly in X-ray tubes allows for smooth rotation of the anode.
    • Oil is used in the liquid-bearing method to improve rotation in modern CT.

    Brazed Graphite Disks and Metal Envelope Tubes

    • Brazed graphite disks increase heat-storage capacity compared to all-metal disks due to their high thermal conductivity.
    • Metal envelope tubes can use higher tube currents compared to conventional tubes due to their strength and durability.

    CT Scanner Components and Functions

    • The internal laser in a CT scanner helps to identify the scan plane.
    • The high-frequency generator in a CT scanner produces the high voltage needed for X-ray production.
    • The gantry in a CT scanner holds the X-ray tube and detectors, and allows for rotation and tilting.
    • The wall-mounted laser in a CT scanner helps to identify the scan plane.
    • Most scanners have a 70-cm aperture to accommodate a wide range of patient sizes.
    • The gantry tilting range refers to the ability of the gantry to tilt to different angles.
    • The high-frequency generator is located in a separate room in most modern CT scanners.

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    Description

    Learn about the basic equipment configuration for a CT scanner, including the imaging system, computer system, and image display, recording, storage, and communication system. Understand the locations where these systems are typically housed in a medical facility.

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