Superconductive magnets used in MR are characterized by
a. field strengths of .2T–.35T.
b. the use of liquid helium as a cryogen.
c. resistive magnets with vertical fields.
d. the ability to turn the magnetic field on and off at will.
b. the use of liquid helium as a cryogen.
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The temperature during the incipient stage is only slightly above ambient
A. True B. False
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A. IL-1 B. IL-2 C. IL-3 D. IL-4
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Indicate whether the statement is true or false
The disadvantage of using the largest size image receptor possible to expose a bitewing radiograph is that:
a. unnecessary structures will be imaged. b. exposure times must be increased. c. anatomical limitations may hinder ideal placement. d. it is contraindicated for patients with periodontal disease.