Basic Principles of CT
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| show | Tomo
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| Where did the early acronym CAT (scan) originate from? | show 🗑
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| show | Scout (GE), Topogram (Siemens), Scanongram (Toshiba)
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| What are some other terms describing Continuous Acquisition Scanning? | show 🗑
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| What is the ability of a system to define small objects distinctly? | show 🗑
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| What is the ability of a system to differentiate, on the image, objects with similar densities? | show 🗑
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| show | Temporal Resolution
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| show | Z axis
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| What does the Z axis do? | show 🗑
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| The data that form the CT slice (Z axis) are furthered sectioned into what 2 elements? | show 🗑
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| What is each one of these 2-D squares are known as a.... | show 🗑
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| show | Cube
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| What is this Cube referred to as a | show 🗑
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| What is the grid called formed from the rows and columns of pixels? | show 🗑
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| show | 512
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| show | Attenuation
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| X-ray photons that pass through objects unimpeded are represented as black on the image and is referred to as having | show 🗑
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| Objects that absorb the X-ray photon will show as white and is know as having | show 🗑
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| How is areas of intermediate attenuations represented | show 🗑
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| show | Density
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| show | Hounsfield Units
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| show | Hounsfield Units
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| What are Hounsfield Units are also referred to as | show 🗑
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| show | 1000
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| show | -1000
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| Water | show 🗑
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| Blood | show 🗑
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| show | 50
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| show | -200
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| show | By measuring HU of objects the Rad may be able to differentiate if a cyst is fluid based or etc
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| show | beam-hardening artifacts
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| show | Beam-hardening
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| show | Cupping
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| show | Volume Averaging
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| show | raw data
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| show | Scan Data
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| ___ ____ have not yet been sectioned to create pixels. | show 🗑
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| The process of using raw data to create an image is called | show 🗑
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| Once raw data has been processed into a pixel, and has been assigned a HU, the data included in the image is known as | show 🗑
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| The reconstruction that is automatically produced during scanning is often called | show 🗑
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| show | The process in using the same raw data to use later to generate new images.
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| show | Axial scanning, Conventional scanning, or Serial scanning
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| show | Spiral or Helical scanning
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| What changed in 1992? | show 🗑
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| show | Anterior & Ventral
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| What term describes movement towards the back surface of the body? | show 🗑
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| show | Inferior or Caudal
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| show | Superior, Cephalic, or Cranial
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| What term refers to sides of the body? | show 🗑
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| show | Medial
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| show | Distal
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| show | Proximal
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| The terms distal and proximal describe ____. | show 🗑
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| _____ & ______ planes are parallel to the floor. | show 🗑
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| _____ & ______ planes are perpendicular to the floor. | show 🗑
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| What plane divides the body into anterior & posterior? | show 🗑
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| show | Sagittal
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| If the sagittal plane is located directly in the center of the body what is it referred to as | show 🗑
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| show | Located either to the left or right of the midline.
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| show | Axial or cross-sectional planes
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| show | Oblique
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| What can you change to show the same structures in a different perspective and how is this done? | show 🗑
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| show | Changing the image plane
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| What 2 distinct reasons would you change the scanning plane? | show 🗑
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| show | When fast moving electrons slam into a metal target.
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| show | electromagnetic energy
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| What does the x-ray tube have that provides the electrons that create the x-ray photons? | show 🗑
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| show | It heats, until electrons boil off, hovering around the filament.
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| What is the group of electrons surrounding the filament referred to as | show 🗑
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| show | High voltage or kV
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| The high voltage / kV propels the electrons from the filament to the _____ | show 🗑
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| What is the term to where the electrons hit the anode & produce the x-ray beam? | show 🗑
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| The quantitiy of electrons is propelled and controled by | show 🗑
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| mA is measured in | show 🗑
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| Increasing _____ , increases ______, with which the electrons hit the target and increasing the x-ray beam. | show 🗑
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| show | kV
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| The ability of the tube to withstand the heat is | show 🗑
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| The ability to rid itself of heat is | show 🗑
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| show | Data Acquisition System (DAS)
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| show | Central Processing Unit (CPU)
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| show | 1) Data Acquisition
2) Image Reconstruction
3) Image Display
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| show | Get Data
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| show | Use Data
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| Image Display? | show 🗑
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| show | Godfrey Hounsfield & Allan Cormack
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