gadolinium enhancement agents will readily pass through the normal blood brain barrier
true or false - false
tissues that are less efficient at spin-spin interactions because they contain more free water, such as CSF,
should have
A) High T2 values and produce hypointense signals
B) HIgh T2 val...
ARMRIT
gadolinium enhancement agents will readily pass through the normal blood brain barrier
true or false - false
tissues that are less efficient at spin-spin interactions because they contain more free water, such as CSF,
should have
A) High T2 values and produce hypointense signals
B) HIgh T2 values and produce hyperintense signals
C) low T2 values and produce hypointnese signals
D) low T2 values and produce hyperintense signal - High T2 values and produce hyperintense
signals
in a large main magnetic field such as those employed in MRI, the motion of a hydrogen proton has been
described as wobbling like a spinning top. this motion is called
A) precession
B) resonance
C) frequency
D) angular momentum - precession
magnetic resonance imaging is derived from the process known as:
A) magnetic resonance angiography
B) magnetic relaxation imaging
C) nuclear magnetic resonance
D) nuclear resonance imaging - nuclear magnetic resonance
Once the nmv has moved away from equilibrium, the following will occur
A) the longitudinal component will increase
B) the transverse component will decrease
C) the longitudinal component will stay the same
,D) the transverse component will increase - the transverse component will increase
In MR, substances respond to a specific radio frequency which is known as:
A) magnetic frequency
B) radio frequency
C) gyro-magnetic frequency
D) resonance frequency - resonance frequency
the introduction of gadolinium based contrast enhancement agents by intra-venous injection can involve
passing through an abnormal blood brain barrier. the tissue compartments involved are the:
A) intravascular to interstitial
B) extracellular to intracellular
C) hepatobiliary to renal
D) extradural to renal - intravascular to interstitial
t2 is the measurement of time fot the transverse component of the NMV to decrease what percentage
of its maximum value after the application of a 90 degree radio-frequency pulse
A) 33%
B) 63%
C) 37%
D) 67% - 37%
in the USA, the MRI system's magnetic field and vector that represents it is symbolized:
A) B1
B) B2
C) B3
D) B0 - B0
The resonance frequency of any substance in a magnetic field can be calculated by employing the
,A) damadian equation
B) larmor equation
C) faraday equation
D) lauterbur equation - Larmor equation
in a pulse sequence, transmitting an initial 90 degree radio-frequency pulse will cause the NMV to:
A) remain at equilibrium
B) shift in both size and direction
C) move to antiparallel
D) rephase - shift in both size and direction
Different tissues that have signals that appear similar on an MR image are described as:
A) hypointense
B) hyperintense
C) isointense
D) isodense - isointense
Which type of electromagnetic coils are designed to stimulate and detect an MR signal?
A) gradient coils
B) radio-frequency coils
C) shim coils - radio-frequency
magnetism can be defined as the ability of certain substances to attract:
, the purpose of magnetic resonance angiography is to image the:
A) stationary soft tissue
B) blood flow
C) vessel lumen
D) only abnormal vessels - blood flow
the strength of very large magnetic fields like those employed in MRI systems, the SI unit most
commonly used is:
A) Tesla
B) Gauss
C) Kilogauss
D) militesla - Tesla
the larmor frequency of hydrogen protons in a 1.5 tesla magnetic field is:
A) 6.4 MHZ/Tesla
B) 12.8 MHz/Tesla
C) 25.5 MHz/tesla
D) 63.9 MHz/tesla - 63.9 MHz/Tesla
In MR imaging, for chemical substance to be affected by the main magnetic field and the radio-wave it
must contain an:
A) Odd number of electrons
B) Odd number of total protons and neutrons
C) Even number of total electrons and neutrons
D) even number of protons - Odd number of total protons and neutrons
A 1.5T magnetic field is equal to:
A) 150 gauss
B) 1500 gauss
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICMATERIALS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
