EEG BOARD Prep (Part 1)

EEG BOARD Prep (Part 1) The basic unit for measuring current flow is: a. atomic weight b. Coulomb c. Volt d. Ampere d. ampere The basic unit of resistance is: a. Ohm b. Coulomb c. Ampere d. Volt a. ohm Which of the following is NOT a valid expression of Ohm's Law: a. R=EI or (R=VI) b. E=IR or (V=IR) c. I=E/R or (I=V/R) d. R=E/I or (R=V/I) a. R=EI or (R=VI) Which of the following is NOT a unit for measuring alternating frequencies: a. cycles per second b. volts c. hertz d. kilocycles b. volts Which of the following describes the action of a capacitor? a. opposes changes in current flow b. converts A/C to D/C c. creates a direct current resistance d. stores energy d. stores energy A circuit that allows some frequencies to pass through it, while others are blocked is a: a. resistor b. transistor c. filter d. reactor c. filter A combination of electronic components designed to increase the power, voltage or current of a signal: a. amplifier b. line filter c. master gain control d. sensitivity a. amplifier A small fluctuating output recorded by the EEG instrument even when there is no input signal is called: a. output voltage b. linear distortion c. 60Hz interference d. noise d. noise The EEG amplifier is designed so that when input 1 is more negative than input 2, the deflection will be upward Common mode rejection is: a. the ability of an amplifier to cancel out ECG artifact b. the characteristic of an amplifier that rejects external interference c. is dependent on the sampling rate d. controlle by the 60-cycle notch filter b. the characteristic of an amplifier that rejects external interference Which of the following is most attenuated by a low frequency filter of 1 Hz? a. 0.5 Hz b. 5.0 Hz c. 10.0 Hz d. 0.1 Hz d. 0.1 Hz Time constant is defined as the time required for the deflection to fall (decay): a. to 47% of the peak deflection b. 57% of the peak deflection c. 77% of the peak deflection d. to 37% of the peak deflection d. to 37% of the peak deflection An EEG record has 3/sec spike & wave discharges. Both the spike and the slow wave have voltages of 100uV. If this discharge is recorded with a LFF of 5Hz and a sensitivity of 10uV/mm, what would be the deflection of the spike and the wave? a. spike 10mm & wave 6mm b. spike 6mm & wave 10mm c. spike 10mm & wave 10mm d. spike 6mm & wave 6mm a. spike 10mm wave 6mm A high frequency setting of 35Hz would attenuate 50Hz muscle activity by approximately what percentage: a. 10% b. 20% c. 40% d. 100% c. 40% According to ACNS Guidelines, Recording on Clinical EEG on Digital Media requires monitors to have between 25 & 35mm/second horizontal scaling and a: a. maximum of 1,000 data points/second to accurately display EEG on the monitor screen b. minimum of 100 data points/second to accurately display EEG on the monitor screen c. maximum of 100 data points/second to accurately display EEG on the monitor screen d. minimum of 1,000 data points/second to accurately display EEG on the monitor screen b. MINIMUM of 100 data points/second to accurately display EEG on the monitor screen The filters creating a very narrow band pass that should RARELY be used clinically are: a. LFF 5.0Hz & HFF 70Hz b. LFF 5.0Hz & HFF 15Hz c. LFF 0.1Hz & HFF 70Hz d. LFF 0.1Hz & HFF 15Hz b. LFF 5.0Hz & HFF 15Hz During the recording of cerebral activity, the calibration input voltage is changed from 50uV to 100uV...what will be the result? a. no effect on the activity being recorded b. a two-fold increase in amplitude c. a one-half reduction of amplitude d. clipping of the waveform a. no effect on the activity being recorded A spike is printed out on paper and measures 16mm peak to peak, the sensitivity of the instrument is 7uV/mm and a calibration signal of 50uV causes a deflection of 7.1mm...what is the voltage of the spike? a. 1.2uV b. 112uV c. 12uV d. 24uV b. 112uV What input voltage is necessary to give a calibration deflection between 5 and 10mm if the sensitivity is 30uV/mm? a. 10uV b. 50uV c. 100uV d. 200uV d. 200uV According to the ACNS Guidelines 2006, the minimum sampling rate for EEG data, should be at least how many times the highest HFF setting: a. two b. three c. four d. ten b. three In a record with 10Hz alpha activity, when the display epoch is changed from 10 seconds/display screen to 20 seconds/display screen, the frequency of the activity will be: a. 5Hz b. 15Hz c. 20Hz d. 10Hz d. 10 Hz In a DC calibration wave, if in channel-B compared to channel-A, is "slower", what instrument change would have been made to channel B: a. display epoch length b. decrease LFF c. increase HFF d. sensitivity b. decrease LFF Guidelines for recording digital EEG are written by: a. the American Society of Electroneurodiagnostic Technologist (ASET) b. the American Academy of Neurology (AAN) c. the American Clinical Neurophysiology Society (ACNS) d. the Organization of Societies of Electrophysiological Technology (OSET) c. the American Clinical Neurophysiology Society (ACNS) The term RAM means: a. read only memory used for archiving data b. the amount of data that can be stored on a rewritable CD c. the amount of data that can be stored on a DVD d. temporary memory storage that is critical to rapid computer operations d. temporary memory storage that is critical to rapid computer operations Three basic computer PORTS are: a. intranet, internet & extranet b. internal, external & bifid c. serial, paradoxical & US d. serial, parallel & USB d. serial, parallel & USB The best metals for clinical EEG recording are: a. gold-plated lead, nickel or silver b. silver-silver chloride, platinum or gold c. tin, copper, or silver-silver chloride d. stainless steel, platinum or silver b. silver-silver chloride, platinum or gold Which electrodes do NOT record directly from the brain? a. depth b. sub-dermal c. subdural d. epidural b. sub-dermal Which of the following is NOT related to measuring electrode resistance? a. opposition to D/C flow b. measurement while the electrode is unattached to the scalp c. measurement with an ohmmeter d. opposition to A/C flow d. opposition to A/C flow The distance from Cz to Pz is 6.8cm. What is the distance from nation to inion? a. 34cm b. 35mm c. 36mm d. 37cm a. 34cm The electrode site that is located 1cm above, 1/3 the distance out from the left external auditory meatus toward the left outer canthus is called: a. T1 or F9 b. F7 or F8 c. F5 d. LOC a. T1 or F9 Due to a central scalp lesion, C4 has to be relocated 4mm anteriorly. The technologist should: a. relocate C3 4mm anteriorly b. make no other placement changes c. relocate P3 4mm anteriorly d. relocate all electrodes in the right parasagittal plane 4mm anteriorly a. relocate C3 4mm anteriorly In a referential montage, how is the origin of the potential determined: a. morphology b. phase reversal c. amplitude d. polarity c. amplitude . . A patient can become the pathway for least resistance and therefore electrically susceptible to shock when: a. the recording instrument is turned on b. the electrode test is utilized c. depth electrodes are used d. the patient has an indwelling heart catheter d. the patient has an indwelling heart catheter Eye leads placed at the outer canthus of each eye will record: a. all eye movements b. horizontal & vertical eye movements c. only vertical eye movements d. mainly horizontal eye movements