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MRI Physics Chapter 3 Questions and Answers 100% Pass $9.99
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MRI Physics Chapter 3 Questions and Answers 100% Pass Why is a strong gradient field needed in MRI? To achieve precise spatial encoding of signals What happens to image resolution when voxel size is reduced? Resolution improves, but SNR may decrease How does increasing the bandwidth...

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  • March 14, 2025
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  • 2024/2025
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  • MRI Physics Chapter 3
  • MRI Physics Chapter 3
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MRI Physics Chapter 3 Questions and
Answers 100% Pass
Why is a strong gradient field needed in MRI?


✔✔ To achieve precise spatial encoding of signals




What happens to image resolution when voxel size is reduced?


✔✔ Resolution improves, but SNR may decrease




How does increasing the bandwidth affect scan time?


✔✔ It reduces scan time but may increase noise




What is the purpose of fat suppression techniques in MRI?


✔✔ To eliminate fat signal and enhance tissue contrast




Why is steady-state free precession (SSFP) used in MRI?


✔✔ It provides high signal intensity with short scan times




1

,How does parallel imaging reduce scan time?


✔✔ It acquires fewer phase-encoding steps, speeding up image acquisition




What is the primary factor that determines tissue contrast in MRI?


✔✔ The relaxation properties of tissues




What is the function of gradient moment nulling?


✔✔ It reduces motion artifacts in MRI scans




How does motion affect MRI images?


✔✔ It causes blurring and ghosting artifacts




Why is MRI considered safer than CT for soft tissue imaging?


✔✔ It does not use ionizing radiation




What is the primary purpose of the main magnetic field in MRI?


✔✔ To align hydrogen protons in the body




2

, How does increasing the magnetic field strength affect signal-to-noise ratio (SNR)?


✔✔ It increases SNR, improving image quality




What happens to hydrogen protons when an RF pulse is applied?


✔✔ They absorb energy and move into a higher energy state




Why is relaxation time important in MRI?


✔✔ It determines how tissues appear on different sequences




What is the role of T1 relaxation in MRI?


✔✔ It measures the time it takes for protons to realign with the magnetic field




How does T2 relaxation differ from T1 relaxation?


✔✔ T2 measures the time it takes for protons to lose phase coherence




What factor primarily affects T1 relaxation time?


✔✔ The molecular structure of the tissue




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