What are the purposes and properties (magnitude, frequency, duration, and direction) of B0 and B1 in...

What are the purposes and properties (magnitude, frequency, duration, and direction) of B0 and B1 in MRI?

Expert Solution

Any magnetization that is transverse (perpendicular) to an applied magnetic field B will precess around that B field at the Larmor frequency.

In MRI there are 3 kinds of magnetic fields:

1. B0 – the main magnetic field

2. B1 – an RF field that excites the spins

3. Gx, Gy, Gz – the gradient fields that

provide localization

Major steps in a 1D MRI experiment are

1.

Object to be imaged is placed into the main field, B0. Subsequently, the object develops a distribution of magnetization, m0(x,y,z), that is to be imaged. This magnetization is aligned with B0 (in the z-direction).

2. Rotating RF magnetic field, B1, is applied to tip the magnetization into the plane that is transverse to B0. While in this plane, the magnetization precesses about the main field at afrequency proportional to the strength of the main field (ω = γB). This precessing magnetization creates a voltage in a receive coil, which is acquired for subsequent processing.

genius_generous answered 2 years ago

Find b0, b1, and b2 to fit the second degree parabola =b0+b1 x+b2 x2 for the following...

Find b0, b1, and b2 to fit the second degree parabola =b0+b1 x+b2 x2 for the following data: x 1 2 3 4 y 1.7 1.8 2.3 3.2 b0 = -2, b1=-0.5, b2 = -0.2 b0 =2, b1= -0.5, b2 = 0.2 b0 =2, b1=0.5, b2 =0.2 b0 =2, b1=0.5, b2 = -0.2

What are examples of the five properties associated with force? 1. Direction: 2. Orientation: 3. Magnitude:...

What are examples of the five properties associated with force? 1. Direction: 2. Orientation: 3. Magnitude: 4. Point of Application: 5. Line of action:

iii Show that any finite Lattice L has a b0 and b1, where t ≥ b0,...

iii Show that any finite Lattice L has a b0 and b1, where t ≥ b0, t ≤ b1, for all t ∈ L.

Magnitude and direction.

A long straight wire in the horizontal plane carries a current of 50A in north to south direction. Find the magnitude and direction of B at a point 2.5m east of the wire.

What are the magnitude and direction of the electric field?

A small object of mass 3.96 g and charge -17.1 µC is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. What are the magnitude and direction of the electric field?What is the magnitude _________ N/CWhat is the direction (upward East West downward)

Demand function for Greek yogurt is assumed to be: QGY = B0 + B1 * PGY...

Demand function for Greek yogurt is assumed to be: QGY = B0 + B1 * PGY + B2 * PNGY + E QGY : demand quantity of Greek yogurt. PGY: price of Greek yogurt. PNGY: price of Non-Greek yogurt. (1) What signs do you expect on B1 and B2? Why B0, B1, B2 are estimated as follows: ^B0 = −20.05 with standard error se^B0 = 36.97. ^B1 = −19.50 with standard error se^B1 = 1.35. ^B2 = 7.56 with standard...

Show that OLS estimators of b0 and b1 are efficient? please answer is not be too...

Show that OLS estimators of b0 and b1 are efficient? please answer is not be too long or short

A. Assume b0 = 12.953, and b1 = -2.5. For x = 25, predict y. Round...

A. Assume b0 = 12.953, and b1 = -2.5. For x = 25, predict y. Round to 3 digits. B. if x is increased by 10 units, how much does y-hat change? Round to 3 digits. Use the points to answer the following: x y 12 17 21 15 28 22 8 19 20 24 C. How much correlation is there between x and y? Round to four decimals and use leading zeros if necessary. D. How much of the...

Magnitude and direction of the magnetic field

A proton moves perpendicular to a uniform magnetic field B at a speed of 1.30 x 10^7 m/s and experiences an acceleration of 2.40 x 10^13 m/s^2 in the positive x direction when its velocity is in the positive z direction. Determine the magnitude and direction of the field?

With an Arduino Uno: Using 2 external buttons b0 and b1 to represent ‘0’ and ‘1’,...

With an Arduino Uno: Using 2 external buttons b0 and b1 to represent ‘0’ and ‘1’, design a sequence detector to detect a pattern “1101”. An LED lights up once, when the sequence “1101” occurs.

Question