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Chapter:

30+ Medical Imaging Solved MCQs

in A Level Physics

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .

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Chapter: Medical Imaging
1.

Gradual decrease in x-ray beam intensity as it passes through material is called

A. attenuation
B. decay
C. radioactivity
D. imaging
Answer» A. attenuation
discuss
2.

Attenuation coefficient of bone is 600 m-1 for x-rays of energy 20 keV and intensity of beam of x-rays is 20 Wm-2, then intensity of beam after passingthrough a bone of 4mm is {{}}

A. 3 Wm-2
B. 2.5 Wm-2
C. 2.0 Wm-2
D. 1.8 Wm-2
Answer» D. 1.8 Wm-2
discuss
3.

For protons, the gyromagnetic ratio has the value {{}}

A. 3 × 108rads-1 T-1
B. 2.68 × 108rads-1 T-1
C. 4 × 108rads-1 T-1
D. 5 × 108rads-1 T-1
Answer» B. 2.68 × 108rads-1 T-1
discuss
4.

Energy passing through unit area is

A. intensity of x-ray
B. frequency of x-ray
C. wavelength of x-ray
D. amplitude of x-ray
Answer» A. intensity of x-ray
discuss
5.

speed of ultrasound depends upon

A. medium
B. amplitude
C. material
D. wavelength
Answer» C. material
discuss
6.

Bones look white in x-ray photograph because

A. they are bad absorbers of x-rays
B. they reflect x-rays
C. they are good absorbers of x-rays
D. they are bad absorbers of ultraviolet rays
Answer» C. they are good absorbers of x-rays
discuss
7.

Larmor frequency depends upon the

A. individual nucleus
B. magnetic flux density
C. both A and B
D. energetic flux unit
Answer» C. both A and B
discuss
8.

Acoustic impedance of human skin is {{}}

A. 1.65 × 106 kg m2 s-1
B. 1.71 × 106 kg m-2 s-1
C. 2 × 10 6 kg m-2 s-1
D. 2 × 107 kg m-3 s-2
Answer» B. 1.71 × 106 kg m-2 s-1
discuss
9.

In the best piezo-electric substances, the maximum value of strain is about

A. 0.5 %
B. 0.4 %
C. 0.3 %
D. 0.1 %
Answer» D. 0.1 %
discuss
10.

With gel between skin and transducer percentage of reflected intensity of ultrasonic is

A. 0.03%
B. 0.05%
C. 0.06%
D. 0.08%
Answer» A. 0.03%
discuss
11.

Attenuation coefficient depends on

A. frequency of x-ray photons
B. wavelength of x-ray photons
C. energy of x-ray photons
D. amplitude of x-ray photons
Answer» C. energy of x-ray photons
discuss
12.

x-rays are filtered out of human body by using

A. cadmium absorbers
B. carbon absorbers
C. copper absorbers
D. aluminum absorbers
Answer» D. aluminum absorbers
discuss
13.

Wavelength of x-rays is in range

A. 10 -8 to 10 -13 m
B. 10 -7 to 10 -14 m
C. 10 -10 to 10 -15 m
D. 10 2 to 10 9 m
Answer» A. 10 -8 to 10 -13 m
discuss
14.

If fast moving electrons rapidly decelerate, then rays produced are

A. alpha rays
B. beta rays
C. gamma rays
D. x-rays
Answer» D. x-rays
discuss
15.

As the x-rays pass through matter, it's intensity

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on the object
Answer» B. decreases
discuss
16.

X-rays have

A. short wavelength
B. high frequency
C. both A and B
D. longest wavelength
Answer» C. both A and B
discuss
17.

Acoustic impedance is defined as

A. ρ⁄c
B. ρc
C. c⁄ρ
D. ρ+c
Answer» B. ρc
discuss
18.

A sound wave which has frequency higher than the upper limit of human hearing is

A. infra sonic
B. ultrasonic
C. supersonic
D. megasonic
Answer» B. ultrasonic
discuss
19.

Fatty tissues have

A. relaxation time of several seconds
B. relaxation time of several hundred nanoseconds
C. intermediate relaxation times
D. relaxation times of several hundred milliseconds
Answer» D. relaxation times of several hundred milliseconds
discuss
20.

Angular frequency of precision is called

A. Lower frequency
B. higher frequency
C. Larmor frequency
D. linear frequency
Answer» C. Larmor frequency
discuss
21.

Scattered x-ray beams approach the detector screen

A. perpendicularly
B. parallel
C. anti-parallel
D. at an angle
Answer» D. at an angle
discuss
22.

Maximum energy an x-ray photon can have is {{}}

A. e⁄V
B. e
C. eV
D. V
Answer» C. eV
discuss
23.

Soft x-rays have

A. high energies
B. low energies
C. lowest frequency
D. longest wavelength
Answer» B. low energies
discuss
24.

Intensity of x-rays can be increased by increasing

A. frequency
B. current
C. voltage
D. resistance
Answer» B. current
discuss
25.

Bone thickness is equal to {{}}

A. cΔt/2
B. cΔt
C. c/t
D. t/2
Answer» A. cΔt/2
discuss
26.

Hardness of x-ray beam can be increased by increasing

A. voltage
B. current
C. frequency
D. wavelength
Answer» A. voltage
discuss
27.

In x-ray production, the kinetic energy of an electron arriving at anode is

A. 100 keV
B. 200 keV
C. 300 keV
D. 400 keV
Answer» B. 200 keV
discuss
28.

Change in speed of ultrasound causes

A. reflection
B. diffraction
C. refraction
D. image
Answer» C. refraction
discuss
29.

Type of x-rays used to detect break in bone is

A. hard
B. soft
C. both A and B
D. moderate
Answer» A. hard
discuss
30.

Wavelength of 2.0 MHz ultrasound waves in tissue is

A. 7.5 × 10-4 m
B. 8 × 10-5 m
C. 8.5 × 10-6 m
D. 9.2 × 10-3 m
Answer» A. 7.5 × 10-4 m
discuss
31.

Intensifier screens reduces the patient's exposure to x-rays by a factor of

A. 500-600
B. 1000-2000
C. 100-500
D. 10-100
Answer» C. 100-500
discuss
32.

Contrast media consist of elements with

A. lower atomic number
B. higher atomic number
C. metalloids
D. inert gases
Answer» B. higher atomic number
discuss
33.

Thickness of material which decreases intensity of x-ray material to half of original value is

A. quarter thickness
B. half thickness
C. half life
D. 2 times of thickness
Answer» B. half thickness
discuss
34.

A good x-ray source should produce x-rays of narrow beam and

A. parallel x-rays
B. perpendicular x-rays
C. anti-parallel x-rays
D. anti-perpendicular x-rays
Answer» A. parallel x-rays
discuss

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