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RAD. FINAL EXAM QUESTIONS AND ANSWERS
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RAD. FINAL EXAM QUESTIONS AND ANSWERS diff btwn receptor holder and Beam alignment device - ANSWER-the RH only stabilizes the receptor. the BAI stabilizes and helps align the PID to the receptor which receptor holder is dispoabable - ANSWER-stabe bite block what year were standards established...

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  • November 11, 2024
  • 23
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • rad final exam questions and answers

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Copyright © OLIVIAWEST2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED




RAD. FINAL EXAM QUESTIONS AND

ANSWERS


diff btwn receptor holder and Beam alignment device - ANSWER✔✔-the RH only stabilizes the receptor.

the BAI stabilizes and helps align the PID to the receptor


which receptor holder is dispoabable - ANSWER✔✔-stabe bite block


what year were standards established for xray equip. - ANSWER✔✔-1974


film base is made of ? how thick? and its function? - ANSWER✔✔-polyester plastic, 0.2 mm, supports the

emulsion


adhesive layer of film is located on which side? and purpose? - ANSWER✔✔-both sides of film, attaches

the emulsion to the base


the emulsion is composed of - ANSWER✔✔-homogenous mix of silver halide and gelatin.


the 2 types of silver halide are - ANSWER✔✔-AgBr (siliver bromide 80-90%) and AgI (silver iodide 1-10%)


protective layer of film is? - ANSWER✔✔-a thin transparent coating over the emulsion to protect it from

manipulation / damage


describe silver halide crystals positioned behind an amalgam restoration ? or behind air space? -

ANSWER✔✔-amalgam -less energized bc they recieve less radiation. air space - there is less density so

there is more radiation recieved and crystals are highly energized




Copyright ©Stuvia International BV 2010-2024 Page 1/23

, Copyright © OLIVIAWEST2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED


which is used in intraoral xray film? Double emulsion or single emulsion ? - ANSWER✔✔-double

emulsion (emulsion on both sides) bc it requires less radiation exposuire


WHAT ARE 3 FACTORS AFFECTING FILM SPEED (board question) - ANSWER✔✔-1. size of silv halide

crystals (larger is faster)


2. thickness of emulsion


3. presence of radiosensitive dyes


what are the tube side and label side of the outer film wrapping? - ANSWER✔✔-TUBE SIDE : "white in

sight" faces the teeth and tubehead and contains raised ID dot. LABEL SIDE has flap to open film packet


F speed film requires ___ percent of the exposure time that D film used - ANSWER✔✔-60%


optimal storage conditions for film are at what temperature and humidity level - ANSWER✔✔-temp : 50-

70 degrees ........30 to 50 % humidity.


how does image sharpness compare with use of fast or slow speed films - ANSWER✔✔-FAST = less

sharp, big crystals. SLOW = more sharp, small crystals...... HINT TO REMEMBER : if a crackhead has large

crystals they are bouncing off the walls so fast and they lose their mental sharpness. if they have only

small crystals they wont be as hyper and will have more sharpness LOL


compounds that change when exposed to light or radiation are termed - ANSWER✔✔-halides


invisble part of stored energy on a film is called - ANSWER✔✔-latent image


is a screen film more sensitive to fluroescent light or to xrays? - ANSWER✔✔-flurescent light


what device transfers xray energy into visible light - ANSWER✔✔-intensifying screen


INCREASED mA results in - ANSWER✔✔--INCREASED # OF XRAYS

Copyright ©Stuvia International BV 2010-2024 Page 2/23

, Copyright © OLIVIAWEST2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED


-INCREASED DENSITY (darker image)


is duplicating film used intraorally or extraorally? - ANSWER✔✔-NEITHER!!!! its used by itself in a dark

room to make a copy of an exisiting radiograph. IT DOES NOT GET EXPOSED TO XRAYS!!!!!


if exposure time increased how does it affect the NUMBER of xray photons - ANSWER✔✔-also increases


INCREASED kV RESULTS IN - ANSWER✔✔--xrays of HIGHER energy


-INCREASED denisty (darker image)


-LOW CONTRAST (more shades of gray)


-long scale contrast


increased exposure time results in - ANSWER✔✔-icreased density (darkness)


what is short scale and long scale contrast - ANSWER✔✔-SHORT SCALE = high contrast, very black and

white ..... LONG SCALE = low cont, many shades of gray


what 3 factors influence sharpnes - ANSWER✔✔-1. FOCAL SPOT SIZE (smaller is sharper , think of a

needle being sharper than something bigger liek a pencil )


2.FILM COMPOSITION (smaller emulsion crystals are more sharp)


3. MOVEMENT (if pt moves image is blurry and not sharp)


what is Penumbra ? when is it found in images? - ANSWER✔✔-unsharpness / blurring of image around

edges. PRESENT IN EVERY IMAGE TO A CERTAIN EXTENT. but images with a small focal spot have less

Penumbra


what type of object receptor alignment minimizes distortion - ANSWER✔✔-being parallel



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