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MRI Physics Chapter 1 Questions and Answers Latest Update Graded A+ $9.99
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MRI Physics Chapter 1 Questions and Answers Latest Update Graded A+

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MRI Physics Chapter 1 Questions and Answers Latest Update Graded A+ What effect does a longer T2 relaxation time have on tissue appearance in MRI? The tissue appears brighter on T2-weighted images Why do tissues with short T1 relaxation times appear bright on T1-weighted images? Because ...

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  • March 14, 2025
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MRI Physics Chapter 1
  • MRI Physics Chapter 1
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MRI Physics Chapter 1 Questions and
Answers Latest Update Graded A+
What effect does a longer T2 relaxation time have on tissue appearance in MRI?


✔✔ The tissue appears brighter on T2-weighted images




Why do tissues with short T1 relaxation times appear bright on T1-weighted images?


✔✔ Because they recover quickly and emit a strong signal




What happens when the magnetic field is turned off in MRI?


✔✔ The protons gradually return to their natural alignment




What is the relationship between proton density and signal strength in MRI?


✔✔ Higher proton density leads to stronger MRI signals




How does MRI detect differences between normal and abnormal tissues?


✔✔ By analyzing variations in T1, T2, and proton density




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,What is the effect of temperature on MRI signal strength?


✔✔ Increased temperature can slightly alter relaxation times




Why does MRI not use ionizing radiation like X-rays?


✔✔ It relies on magnetic fields and radiofrequency waves instead




What role does the phase-encoding gradient play in MRI?


✔✔ It provides spatial information for image reconstruction




What is the purpose of a 180-degree RF pulse in a spin-echo sequence?


✔✔ To refocus dephased spins and generate an echo




Why do different MRI sequences exist?


✔✔ To emphasize different tissue properties and enhance contrast




How does increasing voxel size affect image resolution in MRI?


✔✔ It reduces spatial resolution but increases signal strength




2

, What is the significance of echo formation in MRI?


✔✔ It allows signal detection after an RF pulse is applied




What property of hydrogen makes it ideal for MRI?


✔✔ Its single proton creates a strong magnetic moment




Why do metallic implants cause artifacts in MRI?


✔✔ They disrupt the local magnetic field and distort the image




What happens to proton spins when they absorb RF energy?


✔✔ They flip to a higher energy state




Why is an external magnetic field required in MRI?


✔✔ To align hydrogen protons and generate a measurable signal




What is the primary component required to generate an MRI signal?


✔✔ A strong magnetic field




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