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A non-invasive technique that uses strong magnetic fields and radio waves to generate detailed images of a body's internal structures for diagnostic purposes.
A narrow bandwidth allows for _slices
The main purpose of the gradient subsystem is to
The majority of superconducting magnets are __ in design and exhibit a (horizontal or vertical) magnetiic field.
What is a latent image?
THE FID CAN BE ALTERED BY
Contrast is need to view the visibility of detail.
What does KVp control?
THE MIDDLE LINES OF K SPACE CONTAIN OVER 90% OF THE
What does the Remnant beam do?
The receiver gandwidth represents the range of frequencies sampled during the
What DIRECTLY controls the energy/penetrating ability of the primary beam?
THE DIFFERENCE IN PRECESSIONAL FREQUENCY OF THE HYDROGEN IN FAT AND WATER IS KNOWN AS
How can object unsharpness be lessened? Correct use of:
What is beam quality?
When and how often should you be fit tested for an N-95 mask?
Staff should wear their identification badges:
The gyromagnetic ratio of h+ in 1 T is
This magnet can be used in horizontal or vertical field system, and have strengths up to 0.3 T, and can be turned off.
Superconductive magnets are limited to _ T in clinical MRI by the FDA.
Step 1 for needle poke, cut or bite includes which of the following: (check all that apply)
Staff should notify their supervisor of all safety concerns.
What are some exposure factors? (aka Technique)
THE OUTER LINES OF K SPACE HOLD
10000 gauss = _ Tesla
Magnets made of blocks or slabs or naturally occurring ferrous material.
How is the best image obtained?
Require the use of solenoid coils due to the orientation of the B0, more effiecient than linear coil, and can be combine with other coils electronically to improve signal uniformity through a region of interest.
What are the steps taken to turn "Latnet Images" into visible images?
If you are with a patient in Room 3 and you hear Code Red paged over head, you should: (check all that apply)
THE DIFFERENCE IN PRECESSIONAL FREQUENCY, DUE TO THE CHEMICAL/MOLECULAR ENVIRONMENT, IS KNOWN AS
Static Images are Spot Films cassettes that are exposed by the remnant beam
Magnets that utilize direct current applied to a coil of wire, and are submerged in liquid helium or cryogen to cool the wires.
THE CHEMICAL SHIFT BETWEEN FAT AND WATER AT 1.5 T IS __, OR H + WATER WILL PRECESS THIS MUCH FASTER THAN THE H+ IN FAT
What is responsible for the production of densities of the radiograph?
What are other words used for Recorded Detail?
Changing either mA or S will cause a change in the degree of blackening?
What do the stream of electrons need to do in order to produce an x-ray?
What is under the direct control of the radiographer to produce quality radiographs?
When is a sharps container considered full?
Main controlling factor of contrast?
A way to express the gradient performance referring to the acceleration of the gradient magnetic field to its maximum amplitude, expressed in units of T/m/s.
The __ Shift person is to check each room for safe working conditions each morning.
How is Beam Modification used?
The visible difference between adjacent radiographic densities?
Less radiation makes an image?
What is the basis for radiographic contrast that attenuate the primary beam to differing degrees?
This type of magnetic shielding uses other magnets and their associated magnetic field to confine the field of the main magnet
If 256 frequency samples are collected and the readout or sampling period is 8 ms, the receiver bandwidth would be
How can involuntry motion be controlled?
What is a major infulence on the size and sharpness of an image?
WHEN IS THE SLICE SELECTION GRADIENT APPLIED
WHEN DOES PHASE ENCODING TAKE PLACE
If the KVp has more energy what does it have?
How can voluntary motion be controlled?
Substances that exhibit a slight increase in the magnetic field when placed in an externally applied magnetic field. They have low and positive susceptibility.
What happens when scatter radiation reaches the IR, what will it do?
Gadilinium is an example of a _ substance
When does Attenuation vary?
Permanent magnets have field strengths of
What is size distortion most affected by?
TO EVALUATE IMAGES WITH T2* CONTRAST _ IMAGES ARE REQUIRED
What are types of Beam Limitations?
What do Beam Modification result in?
These coils utilize additional loops and circiutry to improve the efficiency with which the MR signal is induced in the coil, and increase SNR approximately 40% over the coil of the same size.
THE ONLY WAY THE SPATIAL RESOLUTION CAN INCREASED IS TO
What consists of many lead strips separated by a radiolucent material placed between the patient and the IR?
Changing the mAs will have an effect on the beam
Wires are aligned side by side to create magnet field
What does KVp INDIRECTLY control? (15% rule)
When a patient comes for an exam who has had a nuclear medicine study within 48 hours you should:
Where is the x-ray safety manual located? (choose most correct)
Daisy arrives for work in x-ray in open, mesh-type sandals. What does her supervisor direct her to do prior to starting duty?
SLICE THICKNESS IS DETERMINED BY THESE 2 THINGS
To result in equivalent mAs values, mA & time must change in the opposite direction by the same factor; If you raise one you have to lower the other
What controls beam quality?
If you lower you KVp, what happens to your image?
The true border of an object as seen on a radiograph?
What are Grids?
What happens if you increase KVp?
Decreasing the KVp by 15% will?
System Speed is an arbitrary number given to a specific system. Average speed = 100
THE PHASE ENCODING GRADIENT REPRESENTS
How does distance affect density?
What can under or over development in the chemical processing do?
What is a Grid Ratio?
What areas are contrast used in?
If the KVp is increased what kind of image do you get?
What are the major types of image receptors?
Motion is NOT the most common cause of radiographic unsharpness
THE SIGNAL INDUCED IN A RECEIVER COIL IMMEDIATELY FOLLOWING AN RF EXCITATION PULSE IS KNOWN AS THE
Fuzzy border of an object on a radiograph?
Which of the following constitute and infection control hazard? (check all that apply)
Attenuation is a process by which the primary beam is reduced in energy as it passes through the patient (Absorbed)
The degree of blackening an image?
What does KVp do?
What are (6) characteristics of x-rays?
Allow for increased area of coverage without the reduction in SNR, have multiple coils and receivers.
More radiaiton makes an image
What is the source of x-rays?
This type magnetic shielding uses metal, usually steel, in the scan room walls to contain the fringe field
A higher ratio of lead strips will give a better clan up of scatter ratio
Major components of Fluoroscopic Image?
What will happen if you lower KVp?
IF A THICKER SLICE IS DESIRED
With a smaller OID there is better recorded detail.
The slice location is determined by the
These substances exhibit positive suseptibility, but when placed in an external magnetic field they will remain magnetized when external magnetic field is removed
What specialty department uses Film/Screen Combinations?
Film/Screen Combinations are also used to produce a particular scale of contrast
These substances exhibit a very slight negative or repelling effect when placed in externally applied magnetic field. They have low and negative susceptibility.
When may employees who do not get immunized during the Immunization Program, but decide to get immunized when an outbreak occurs, return to work?
This gradient coil varies the intensity of the magnetic field in the right to left direction
For Infection Control and Prevention those working with patients should wear nothing below the:
RF SHIELDING IS KNOWN AS A
A difference of attenuation causes a formation of the image?
How often should work surfaces be disinfected?
How does Filtration remove patient exposure?
Heartbeat & Peristalsis CAN be controlled by the patient
The receiver bandwidth is determined by the number of
These substances exhibit positive suseptibility , are stronger than paramagnetic substances, but are weaker than ferromagnetic substances, and are used as T2 contrast agents
Code ________ indicates Fire.
Raising the KVp by 15% will?
If you have been poked by a used needle you should:
The chemicals for processing must be at proper?
What is needed to cause the e-stream to accelerate at an extremely high speed from the cathode to the anode?
This gradient coil varies the intensity of the magnetic field in the head to foot direction
What results with a fast film speed (Less Radiation) ?
When performing examination on patient who is on "droplet precautions", what precautions should be taken?
A Film/Screen Combinations are cassettes with intensifying screens that emit a specific color of light and the x-ray film that is sensitive to that same color of light
MRSA stands for:
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