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1117

Biophysique Preparation (Mr. At Vanyat)

 

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1) Select a material which has the lowest attenuation coefficient(dB/cm)?

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2) The region where the beam diameter is most concentrated giving the greatest degree of focus. What is it ?

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3) Ultrasound is the most commonly used diagnostic imaging modality, accounting for approximately……of all imaging examinations performed worldwide nowadays.

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4) The lateral resolution is proportionally affected by………………?

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5) The region where the beam diameter increases as the distance from the transducer increases. What is it?

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6) What is the portion of a sound that is returned from the boundary of a medium?

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7) The ratio of the pressure to the particle velocity is called…………………?

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8) What is the number of cycles per unit of time?

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9) An ultrasound image has lower spatial resolution but greater depth of penetration is given by…?

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10) The part of ultrasound which transmit and receive sound is called…………?

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11) An image of ultrasound has higher spatial resolution but less depth of penetration is given by …?

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12) What is the combination of one rarefaction and one compression?

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13) What is the change of sound direction on passing from one medium to another?

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14) What is an application of ultrasound which is currently using in medical imaging?

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15) What is the boundary between two different media where reflection and refraction occur?

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16) What is the speed of ultrasound travel through human soft tissue?

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17) What is an application of ultrasound which is currently developing?

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18) The region of a sound beam in which the beam diameter decreases as the distance from the transducer increases. What is it ?

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19) A method to image moving blood and estimate blood velocity by exploiting the Doppler effect is called……?

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20) The Specular medium reflections, diffuse reflections are three types of…………….…?

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21) What is the speed at which sound waves travel through a particular medium?

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22) Select a material which has the highest attenuation coefficient(dB/cm)

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23) The reflection at the smooth surface is…………………?

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24) What is the maximum frequency audible to human ear?

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25) What is the decrease in amplitude and intensity as a sound wave travels through a medium?

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26) The ability to resolve objects that lie one above the other is called…………….?

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27) What is the main component of transducer?

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28) What is the application of doppler ultrasound?

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29) The ability to resolve objects side by side is called………………?

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30) The axial resolution is inversely proportional affected by………………?

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31) Please select types of ultrasound image resolution correctly.

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32) The reflection at the rough surface is…………………?

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33) Linear Array probe, Curved probe, Phrased array probe are three types of ……………?

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34) Select a material which has the lowest speed of sound?

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35) Amplitude mode. Where the signals are displayed as spikes that are dependent on the amplitude of the returning sound energy. It is called………………?

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36) What is Ultrasonography?

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37) Select a material which has the highest speed of sound?

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38) What is unit of sound beam attenuation?

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39) Brightness mode. Where the signals are displayed as various points whose brightness depends on the amplitude of the returning sound energy. It is called……………?

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40) What is the frequency range of diagnostic imaging using ultrasound?

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41) Motion mode. The application of B-mode and a strip chart recorder allows visualization of the structures as a function of depth and time. It is called…………………?

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42) What is the distance between the onset of peak compression or cycle to the next?

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