Which statement is false regarding an MR scan:
A.The strength of the field is proportional to the procession frequency of the nuclei.
B.Small current coils are placed across the patient allow a magnetic field to be produced along any plane.
C.Radio emitting coils produce continuous radio waves.
D.Radio waves excite the nuclei changing their spin (energy level) within the B ā field.
E.The contrast is provided because different tissues have different relaxation times .
Which is not a correct advantage of an MRI machine
A.An image can me made of any slice in any orientation from the same scan (a CT scan needs a new scan for each image)
B.The contrast between different tissue types can be waited to investigate different situations (by changing the pulse frequency)
Ā
C.They are able to look at the functionality of the part of the body in question (real time scan)
D.Non ionizing therefore no known side effects
E.
Which is an incorrect disadvantage of an MRI scan:
A.Magnetic fields can induce currents in pacemakers / metal plates which can cause dame and heating effects
B.The scan can take a long time and is bad for people who suffer from claustrophobia
C.Imaging of bones is less resolved than a CT scan
D.A contrast cannot be obtained between softer tissues
E.
Radioactive tracers are used in medicine for imaging purposes. Which type of radiation is best used to produce an image outside of the body:
A.Alpha
B.Beta minus
C.Gamma
D.Neutrons
E.None of the above Ma ma Mia
What is the effective half life of Technetiumā99 which has decay constant of 3.2 x 10^-5 s^-1 if the body has a biological half life of 24 hrs.
State your answer to 2 sig figs
A.4.8 hrs
B.17hrs
C.19.2 hrs
D.21.9 hrs
E.24 hrs
You must be aware of examples of radioactive tracers, their uses and their energies.
Which statement is not true......
A.Technetiumā99 is used to produce an image of a range of organs
B.Iodineā131 is used to image the thyroid gland
C.Indiumā111 is used to image the kidneys
D.Technetiumā99 has the lowest energy gamma emitter and therefore produces the most contrast.
E.
Which statement is incorrect regarding the MolybdenumāTechnetium 99m generator
A.It is used because molybdenum has a smaller half life than technetium
B.Molybdenum bonds with aluminium oxide
C.Technetium does not bond with aluminium oxide
D.A saline solution separates the Technetium
E.
What is correct regarding B
A.It produces an electron via photoelectric effect
B.It produces a photon via scintillation
C.It accelerates an electron via a + p.d
D.It accelerates the electron via a negative p.d
E.
What is correct regarding C
A.It produces an electron via photoelectric effect
B.It produces a photon via scintillation
C.It accelerates an electron via a + p.d
D.It accelerates the electron via a negative p.d
E.
What is the minimum possible wavelength emitted when a positron annihilates with an electron to produce gamma in PET.
A.1.21 x 10^-12 m
B.1.42 x 10^-12 m
C.1.60 x 10^-12 m
D.2.4 x 10^-12 m
E.
Looking at your booklet what do you think would be the most suitable PET tracer.
A.Carbon - 11
B.Nitrogen - 13
C.Oxygen - 15
D.Fluorine ā 18
E.Technetiumā99
F.Iodineā131
G.Indiumā111
What radiation is best used as an implant
A.Alpha
B.Beta
C.Gamma
D.Neutrons
Radiation can be used to destroy cancer cells. Which statement is not true:
A.Beams are fired from a range of angles towards the tumor to reduce the does to the healthy surrounding tissue
B.Cancer cells divide more frequency and are more prone to damage than healthy cells
C.Healthy cells are more likely to be permanently damaged than cancer cells
D.Healthy cells are protected from beams of ionizing radiation via lead shielding
