Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

PET Image Characteristics: Noise and Dead Time

10 Questions

1 Views

PET Image Characteristics: Noise and Dead Time

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the chief benefit of incorporating time-of-flight (TOF) technology in PET imaging?

Increased sensitivity to annihilation photons

Enhancement of signal to noise ratio (SNR) in the reconstructed 3D image matrix (correct)

Reduction in noise equivalent count rate (NECR)

Improved spatial resolution in the axial direction

What is the most appropriate quantitative expression for count rate in PET imaging?

Spatial resolution

Dead time

Noise equivalent count rate (NECR) (correct)

Scatter fraction

What does a standardized uptake value (SUV) of 1 indicate?

An area of increased activity

Completely even biodistribution (correct)

High sensitivity to annihilation photons

Low noise equivalent count rate (NECR)

What are the factors that can affect the SUV for FDG in PET imaging?

Blood sugar at the time of injection and uptake in other tissues Signup and view all the answers

What is the impact of ring geometry on PET imaging?

Variable density of lines of response (LORs) and depth interaction effect (parallax) Signup and view all the answers

What is the consequence of dead time in PET imaging?

Loss of true coincidence Signup and view all the answers

What is the impact of subtracting scatter in PET imaging?

Increases noise due to decreased total counts Signup and view all the answers

How does attenuation correction affect PET images?

Causes an increase in image noise Signup and view all the answers

What is the primary contributor to dead time in PET imaging?

Annihilation photons within coincidence timing window Signup and view all the answers

How can the partial volume effect (PVE) be corrected for quantitative purposes in PET imaging?

By multiplying observed activity concentration by a recovery coefficient Signup and view all the answers