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