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Questions and Answers
What does ECT stand for?
What does ECT stand for?
- Emission Computed Tomography (correct)
- Echocardiogram Test
- Event Correlation Tracking
- Electrical Conductivity Test
X-rays in ECT imaging display the distribution of varied densities in the body by illustrating the attenuation of photons as they pass through.
X-rays in ECT imaging display the distribution of varied densities in the body by illustrating the attenuation of photons as they pass through.
True (A)
What type of cameras produce the images in a scintigram?
What type of cameras produce the images in a scintigram?
scintillation cameras
SPECT produces images of gamma rays or x-rays emitted by ________ tracers.
SPECT produces images of gamma rays or x-rays emitted by ________ tracers.
What energy level of gamma rays is produced when a positron interacts with an ordinary electron in PET imaging?
What energy level of gamma rays is produced when a positron interacts with an ordinary electron in PET imaging?
CT imaging excels in providing functional information, while ECT struggles to determine the exact location of tracer uptake.
CT imaging excels in providing functional information, while ECT struggles to determine the exact location of tracer uptake.
What is measured when photons pass through a patient during a CT scan?
What is measured when photons pass through a patient during a CT scan?
What is a primary advantage of hybrid PET/CT and SPECT/CT systems?
What is a primary advantage of hybrid PET/CT and SPECT/CT systems?
Match the SPECT instrumentation component with its function:
Match the SPECT instrumentation component with its function:
Which collimator is most commonly used in SPECT scintillation cameras to increase sensitivity and resolution?
Which collimator is most commonly used in SPECT scintillation cameras to increase sensitivity and resolution?
What is the purpose of Position Logic in SPECT instrumentation?
What is the purpose of Position Logic in SPECT instrumentation?
Triple head camera systems in SPECT imaging generally offer lesser data acquisition compared to single-head systems.
Triple head camera systems in SPECT imaging generally offer lesser data acquisition compared to single-head systems.
What is the energy (in keV) of I-131, which is used in high-energy SPECT imaging?
What is the energy (in keV) of I-131, which is used in high-energy SPECT imaging?
In SPECT data acquisition, the 'step and shoot' method involves the camera moving, _______, acquiring an image, and then moving again.
In SPECT data acquisition, the 'step and shoot' method involves the camera moving, _______, acquiring an image, and then moving again.
Insanely Difficult: In the context of SPECT data acquisition, the combination of the Step and Shoot method with continuous acquisition seeks to:
Insanely Difficult: In the context of SPECT data acquisition, the combination of the Step and Shoot method with continuous acquisition seeks to:
Flashcards
What does ECT stand for?
What does ECT stand for?
ECT stands for Emission Computed Tomography.
What does X-ray imaging show?
What does X-ray imaging show?
X-ray imaging identifies distribution of different densities in the body by imaging the attenuation of the photons passing through the body.
What does scintigraphy imaging show?
What does scintigraphy imaging show?
Scintigrams are images produced using scintillation cameras, based on photons emitted from a radioactive tracer within the body.
What does SPECT imaging produce?
What does SPECT imaging produce?
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What does PET imaging use?
What does PET imaging use?
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What does CT measure?
What does CT measure?
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What does hybrid PET/CT and SPECT/CT systems combine?
What does hybrid PET/CT and SPECT/CT systems combine?
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What type of Collimator is most commonly used for a Scintillation camera?
What type of Collimator is most commonly used for a Scintillation camera?
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What does a SPECT Gantry do?
What does a SPECT Gantry do?
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What is the software used for in SPECT computer systems?
What is the software used for in SPECT computer systems?
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What is single scintillation camera used for?
What is single scintillation camera used for?
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What does two head cameras do?
What does two head cameras do?
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What is the triple head camera used for?
What is the triple head camera used for?
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What does LEAP and LEHR stand for?
What does LEAP and LEHR stand for?
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What is Step and Shoot?
What is Step and Shoot?
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Study Notes
- ECT stands for Emission Computed Tomography.
X-Ray in ECT
- Provides the distribution of different densities in the body.
- Achieved by imaging the attenuation of photons as they pass through the body.
Scintigram in ECT
- Uses scintillation cameras to produce images.
- Planar images are based on photon emission from a radioactive tracer within the body.
SPECT in ECT
- Produces images of gamma rays or X-rays emitted by radioactive tracers.
PET in ECT
- Images two 511 keV gamma rays produced when a positron interacts with an ordinary electron causing annihilation radiation.
CT
- It measures the attenuation of photons as they pass through the patient.
- Produces measurements of anatomy in the form of an attenuation coefficient
- Excels in producing high-resolution images of a patient's anatomy.
ECT
- Excels in providing functional information, but the exact location of tracer uptake can be difficult to determine.
- Has comparatively poor resolution and sensitivity when compared to CT images.
Hybrid PET/CT and SPECT/CT Systems
- Combines both modalities into one device.
- Allows for the collection of CT and ECT images in one session after automated registration and display.
SPECT Instrumentation: Scintillation Camera
- Collimators, most commonly parallel and fan-beam, can increase sensitivity and resolution..
- NaI (Tl), Position Logic, PHA, Pre-Amp & Amplifier are used.
SPECT Instrumentation: Gantry
- Serves as a frame where the camera rotates.
SPECT Instrumentation: Computer System
- Uses software for image reconstruction and hardware.
SPECT System: Single Scintillation Camera
- Can be used for cardiac imaging.
- Capable of Planar and SPECT imaging.
SPECT System: Two Head Camera System
- A 90° configuration (AP & LAT) provides a greater configuration and can decrease the imaging time with decreased image aquisition time.
- A 180° configuration (AP & PA) is better for planar imaging.
SPECT System: Triple Head Camera System
- A 120 degree dedicated SPECT system can be used for Planar Imaging, provides greater aquisition, and uses a lesser acquisition system
- The system is safer.
SPECT System: LEAP, LEHR
- Uses Tl-201 (72), Tc-99m (140), and I-123 (159).
SPECT System: Medium Energy
- Uses In-111 (171,145) and Ga-67 (93,185,300).
SPECT System: High Energy
- Uses I-131 (364 keV).
SPECT System: Ultrahigh Energy
- Used only for myocardial imaging.
- F-18 is very heavy and may strain the SPECT gantry.
SPECT Data Acquisition: Step and Shoot
- The cameras moves, stops, acquires an image, and moves again.
SPECT Data Acquisition: Continuous Orbit Camera
- They acquiring and counts at all times while the camera is moving (camera moves slowly).
SPECT Data Acquisition: Combination
- Combines both step and shoot, and continuous acquisition.
- The camera stops at a discrete projection angle but it is not turned off during rotation to minimize the blur effect of continuous rotation acquisition
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Description
ECT, including X-Ray, Scintigram, SPECT, and PET imaging methods, each offers unique diagnostic capabilities. CT excels in anatomical imaging, while ECT provides functional insights, though with lower resolution. Understanding these modalities is crucial for medical diagnostics.
