Aliasing - Study guides, Class notes & Summaries

CAMRT 2023 EXAM QUESTIONS WITH COMPLETE SOLUTION Why include ant ST on lat Cspine - CORRECT ANSWERS Pre verterbal fat stripe- widening=#, mass, inflammation Air gap technique - CORRECT ANSWERS reduces scatter, increases contrast IP 10-15 cm away from pt mAs increase 10% for every cm gap Not effective with high kV why expiration with pneumo - CORRECT ANSWERS reduces lung vol, pneumo occupies larger area- easier to see...

According to the Bernoulli Principle, where will you find the lowest pressure in a vessel with stenosis? A. proximal to the stenosis B. distal to the stenosis C. in the collateral vessels D. at the site of stenosis D. at the site of stenosis Which of the following is a system adjustment that is made when changing from a lower extremity arterial exam to a lower extremity venous exam on the same patient? A. reverse the color display baseline B. decrease transducer frequency C. de...

1 CPSGT PT.1 EXAM | QUESTIONS & ANSWERS (VERIFIED) | LATEST UPDATE | GRADED A+ Informed consent may be _________, ________, or _________. Correct Answer: written, verbal or implied. List 5 Basic Principles of informed consent Correct Answer: 1. PT has the right to information 2. Questions regarding diagnosis or treatment should be referred to physician 3. Risks and discomforts to patients should be listed. 4. Participation in all procedures is voluntary. 5. Consent may be signed by...

A 10Hz signal passing through a 10Hz locut filter will be: A) Reduced in frequency to approximately 7hz B) Affected in no way C) Reduced in amplitude by approximately 30% D) Eliminated - C) Reduced in amplitude by approximately 30% A 60Hz notch filter should not be used for evoked potential recording because of: A) The ringing artifact that comes from distortion of the stimulus artifact B) Aliasing of the signal by the filter C) 60Hz interference coming from various OR equipment D) Comm...

The doppler shift is 5000 Hz. The pulse repetition frequency is 9000 Hz. Which of the following is true? A. peak pressure gradient is 36mmHg B. range ambiguity will occur C. aliasing will occur D. the peak velocity is equal to 2 m/s - ️️C. aliasing will occur When evaluating a suspected arterial stenosis, a doppler angel of ____ degrees will produce the most accurate flow velocity. A. 0 B. 30 C. 60 D. 90 - ️️A. 0 Spatial resolution is: A. the minimum reflector separation req...

SPI ARDMS Exam (2024) || Questions & Solutions (100% Accurate) SPI ARDMS Exam (2024) || Questions & Solutions (100% Accurate) What is increased if the pulse duration is decreased? - ANSWER - a) Bandwidth b) Line Density c) Frame Rate d) Duty Factor What is the most appropriate action for the sonographer to take when receiving a verbal order for an exam? - ANSWER - a) Deny performance of the exam until a written request is received b) Seek approval from supervisor c) Verbally repeat...

COMD 5070 exam 34 features of the scientific method: - correct answer empirical, deterministic, predictive, parsimonious Octave - correct answer a doubling or halving of a frequency How many semitones in an octave? - correct answer 12. each semitone is a non-linear step in terms of # of Hz from one semitone to the next. However, they all sound equal to us. Sampling rate - correct answer The number of snapshots of the sound in time. ( in Hz) 10 samples is a 10 Hz recording. Generally, th...

What is the unit for magnetic field strength? CORRECT ANSWER 1T=10(kG)=10,000 G What type of artifact is seen exclusively in both phase and frequency directions? CORRECT ANSWER Aliasing What artifact is the result of the recessional difference between fat and water? CORRECT ANSWER Chemical shift The area in which a gradient magnetic field is equal to the external magnetic field is called CORRECT ANSWER Isocenter The loss of phase coherence due to intrinsic and extrinsic magnetic fiel...

What information does the Doppler shift furnish concerning the blood cells that produce it? - Ans - velocity The frequency of a pulsed Doppler wave is 6 MHz, and the PRF is 5 kHz. What is the maximum Doppler shift that can be recorded without aliasing? - Ans - 2.5 kHz When a reflector moves toward the transducer, what will happen to the reflected frequency? - Ans - increase Which of the following is not include in the information that is processed by a standard duplex ultrasound system? -...

When transporting a patient with a urinary catheter the bag should always be: - Answer-Below the patients bladder A 52 year old woman develops a murmur after a myocardial infarction. What is the most likely etiology? - Answer-Ventricular Septal Defect How do you position a patient for using a PEDOF probe along the right sternal border? - Answer-Right lateral decubitus A patient with down syndrome (trisomy 21) is referred to your lab for an echo. Which of the following cardiac defects woul...