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