5 Image Presentation and Computers

1) The type of computer memory that allows temporary storage for programs and data is called:

a. ROM b. RAM c. Rad d. REM

2) A high pass image filter removes:

a. relatively lower frequencies b. relatively higher frequencies

c. frequencies that are both too high and too low d. edges

3) If a film looks mottled, the most likely reason is:

a. incorrect temperature of developer b. too little fixer in processor

c. expiration date of film has passed d. light leak in darkroom

4) Output devices in nuclear medicine include:

a. CRTs

b. video monitors c. magnetic tape d. all of the above e. a and b only

5) Which of the following will not cause a film to be fogged?

a. damaged safelight in darkroom

b. developer temperature too high

c. light leak into dark room

d. crack in film cassette

6) Which part of the computer is used for data filtering?

a. buffer

b. array processor c. ROM

d. ADC

7) Which of the following is not true regarding data acquisition in frame mode?

a. it requires much less memory than list mode

b. it has a higher acquisition rate compared to list mode c. data cannot be divided into different images at a later

time

d. incoming data are stored in time sequence

8) Which is most useful for gated first pass cardiac studies?

a. list mode b. frame mode

9) Static on film may result from:

a. removing a sheet of film too quickly from the box or cassette

b. contact with skin

c. contact with dust and/or lint particles d. all of the above

10) Which type of filter is used exclusively with dynamic images?

a. spatial

b. temporal

c. band pass

d. low pass

11) Assuming speed of retrieval is unimportant,

which archiving option would be the best choice for a department with a limited budget?

a. magneto-optical disk b. floppy disk

c. magnetic tape d. hard disk

12) If films appear too light, which of the following should be monitored?

a. chemicals are replenished at the correct rate b. developer temperature is set according to manu-

facturer’s recommendation

c. water does not overflow into developer in the film processor

d. all of the above e. a and b only

13) Which of the following does not describe an optimal situation for storing 5

/

inch floppy disks?

a. dust free environment b. humidity of 40–50%

c. stacked against one another before boxing d. room temperature not higher than 72° Fahrenheit 14) Which of the following describes the fixing process?

a. the undeveloped sodium iodide crystals are removed and the developing process is stopped

b. silver halide crystals become reduced to metallic silver c. the undeveloped silver halide crystals are removed

and the developer is neutralized d. none of the above

15) Filtered back projection of SPECT data initially creates:

a. transaxial images

b. sagittal images

c. coronal images

d. oblique images

16) Filtering of SPECT data may take place:

a. before reconstruction b. during reconstruction c. after reconstruction d. all of the above

17) Double emulsion film is used most often in nuclear medicine departments.

a. true b. false

18) If a technologist notices an unexpected hot spot on a film, he or she should:

a. take oblique or lateral views of the area b. attempt to remove the source of the signal by

cleansing or removal of clothing and reimage, noting difference for physician (i.e. pants removed, etc.) c. circle the hot spot, and identify the source d. all of the above

e. a and b only

19) When presenting a bone scan to a physician for interpretation, the technologist should be certain that which of the following are noted on the film or patient’s request form.

a. right and left sides b. injection site c. age

d. fracture history e. all of the above 20) Film should be stored:

a. on its side

b. after the foil wrapper has been removed c. in a temperature controlled area d. all of the above

e. a and c only

21) PET images are reconstructed using:

a. coincidence detection b. filtered back projection c. k space filling

d. fast fourier transform

22) Following an annihilation reaction, two 511 keV photons are emitted in opposite directions. If one of the photons is deflected in the body:

a. only the unscattered photon will contribute to the image.

b. the deflected photon may be detected outside the LOR.

c. the LOR may contain an angle.

d. none of the above