Biophysique Test

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Biophysique Test

 

1 / 60

Dans une expΓ©rience de laboratoire, on expose une feuille d’aluminium Γ  des photons X de 60 keV. Que reprΓ©sente le coefficient d’attΓ©nuation linΓ©ique (ΞΌ) dans ce contexte ?

2 / 60

En radiothΓ©rapie, un plan de traitement est Γ©tabli Γ  l’aide d’un scanner dosimΓ©trique. Le faisceau de traitement est ensuite dΓ©fini par un collimateur multilames. Quel appareil produit un faisceau de rayons X de haute Γ©nergie (> 6 MeV) en radiothΓ©rapie moderne ?

3 / 60

Un physicien mΓ©dical mesure une activitΓ© de 3,7 Γ— 10⁹ Bq autour d’une source de Cobalt-60. Quel type de rayonnement nΓ©cessite la plus grande Γ©paisseur de protection ?

4 / 60

Dans une expΓ©rience de laboratoire, on expose une feuille d’aluminium Γ  des photons X de 60 keV. Pourquoi ne peut-on pas observer l’interaction par crΓ©ation de paire dans ce cas ?

5 / 60

Un technicien allume un gΓ©nΓ©rateur Γ  rayons X Γ  100 kV pour une radiographie thoracique. Quelle prΓ©caution est essentielle dans la salle de radiologie ?

6 / 60

Lors d’une curiethΓ©rapie au cΓ©sium-137, le personnel doit se protΓ©ger contre les radiations Γ©manant des sources scellΓ©es. Le type de rayonnement majoritaire Γ©mis par le Cs-137 est :

7 / 60

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

8 / 60

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

9 / 60

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

10 / 60

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

11 / 60

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

12 / 60

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

13 / 60

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

14 / 60

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

15 / 60

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

16 / 60

Select a material which has the highest speed of sound?

17 / 60

What is the combination of one rarefaction and one compression?

18 / 60

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

19 / 60

Please select types of ultrasound image resolution correctly.

20 / 60

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

21 / 60

What is unit of sound beam attenuation?

22 / 60

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

23 / 60

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

24 / 60

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

25 / 60

What is the maximum frequency audible to human ear?

26 / 60

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

27 / 60

A 60-year-old female with a history of severe headaches and dizziness is referred for an MRI to rule out any intracranial pathology. During the pre-MRI screening, it is discovered that she has a pacemaker implanted.

2. Which of the following is a contraindication for performing an MRI in this clinical case?

28 / 60

A 45-year-old male presents with persistent lower back pain radiating to his left leg. The pain has not improved with conservative treatments such as physical therapy and medication. The physician suspects a herniated disc and orders an MRI to confirm the diagnosis.

1. Which of the following is an advantage of using MRI in this clinical case?

29 / 60

What can happen if the volume flow rate of blood or air is too low?

30 / 60

What does the volume flow rate (Q) measure?

31 / 60

What happens to the dynamic range at very low or very high frequencies?

32 / 60

Which of the following is not true about sound waves?

33 / 60

What is the term for the volume flow rate of blood pumped by the heart?

34 / 60

What type of wave is sound when traveling through air?

35 / 60

Why does ear pressure often occur during altitude changes?

36 / 60

How do hair cells convert mechanical vibrations into neural signals?

37 / 60

In which frequency range is the ear most sensitive, having the widest dynamic range?

38 / 60

The function of outer hair cells in the cochlea is to

39 / 60

Which principle explains how different frequencies affect different parts of the cochlea?

40 / 60

What happens when the pressure inside the middle ear is lower than the external air pressure?

41 / 60

On s’intΓ©resse Γ  l’étude la dΓ©sintΓ©gration Ξ², un proton se transforme en neutron dans le noyau selon la rΓ©action
suivante. Γ‰crivez l’équation de conservation du nombre leptonique.

42 / 60

On considΓ¨re de la diffusion Compton d’un photon d’énergie h sur un Γ©lectron au repos. Soit h’ l’énergie du photon
aprΓ¨s qu’il soit diffusΓ© d’un angle . Quelle est l’équation de conservation de l’énergie ?

43 / 60

On s’intΓ©resse Γ  l’étude la dΓ©sintΓ©gration Ξ², un proton se transforme en neutron dans le noyau selon la rΓ©action
suivante. Γ‰crivez l’équation de conservation du nombre baryonique.

44 / 60

Le schΓ©ma de dΓ©croissance de cet isotope est prΓ©sentΓ© ci-dessous. Identifiez la pΓ©riode radioactive.

45 / 60

On s’intΓ©resse Γ  l’étude la dΓ©sintΓ©gration Ξ², un neutron se transforme en proton dans le noyau selon la rΓ©action
suivante. Γ‰crivez l’équation de conservation de la charge.

46 / 60

Le schΓ©ma de dΓ©croissance de cet isotope est prΓ©sentΓ© ci-dessous. Identifiez le type de dΓ©croissance.

47 / 60

On considΓ¨re de la diffusion Compton d’un photon d’énergie h sur un Γ©lectron au repos. Soit h’ l’énergie du photon
aprΓ¨s qu’il soit diffusΓ© d’un angle . Quelles est l’équation de conservation de l’énergie, si l’angle ?

48 / 60

D’aprΓ¨s la dΓ©sintΓ©gration Ξ±, par exemple, le radium 226 se transforme spontanΓ©ment en l’élΓ©ment Y en Γ©mettant d’un
noyau d’hΓ©lium. Donnez la valeur du nombre atomique (Z) du noyau Y de la voie de sortie.

49 / 60

Quelle est la dΓ©sintΓ©gration alpha qui a lieu lors de l’atome radioactive se transforme
spontanΓ©ment en autre atome ?

50 / 60

Quel est l’énergie cinΓ©tique d’électron Compton lors de l’interaction des photons X ou ΰͺ» avec des matiΓ¨res ?

51 / 60

On s’intΓ©resse Γ  l’étude la dΓ©sintΓ©gration Ξ², un proton se transforme en neutron dans le noyau selon la rΓ©action
suivante. Γ‰crivez l’équation de conservation de la charge.

52 / 60

L’activitΓ© initiale d’un radionuclΓ©ide est de 100TBq. Quelle est son activitΓ© aprΓ¨s 2 pΓ©riodes radioactives ?

53 / 60

Quelle est la dΓ©sintΓ©gration beta moins qui a lieu lors de l’atome radioactive se transforme
spontanΓ©ment en autre atome ?

54 / 60

On s’intΓ©resse Γ  l’étude de la rΓ©action nuclΓ©aire ci-dessous. Donnez la valeur de la charge (Z) de particule Ξ² ?

55 / 60

On s’intΓ©resse Γ  l’étude de la rΓ©action nuclΓ©aire ci-dessous. Donnez la valeur leptonique de n ?

56 / 60

Quels sont les trois processus principaux qui ont lieux lors de l’interaction d’un photon avec la
matière?

57 / 60

On s’intΓ©resse Γ  l’étude la dΓ©sintΓ©gration Ξ², par example, la transformation du 32P en 32S par Γ©mission Ξ²-.
DΓ©terminez l’Γ©nergie libΓ©rΓ©e exprimΓ©es en MeV au cours de la transformation. OΓΉ M32P 31,98403 uma, M 32S =
31,98220 uma et 1 uma 931,5 MeV

58 / 60

A 70-year-old male patient with a history of obesity is referred for an echocardiogram. Which of the following is a limitation of echography in this patient?

59 / 60

A 60-year-old male patient with suspected deep vein thrombosis (DVT) is referred for an ultrasound. Which type of probe is most suitable for imaging superficial structures and vessels?

60 / 60

Which of the following is NOT an advantage of echography (ultrasound) in clinical diagnostics?

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