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Medical Physics I Question Paper

Medical Physics I

Course:Bachelor Of Science In Medical Laboratory Science

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE (MEDICAL LABORATORY)

HML 204 – MEDICAL PHYSICS I
=================================================================
DATE:
THURSDAY 24TH DECEMBER 2009
TIME: 11.00 A.M. – 1.00 P.M.

INSTRUCTIONS

Section A:
Answer ALL Questions.
1.
With the aid of a diagram, explain the principle of the endoscope.
(5 marks)
2.
State one use of laser in medicine and explain why the light from a filament lamp
would
is
not
suitable
in
laser
therapy.
(5
marks)
3.
i)
Describe the principle of sphygmomanometry.
(3
marks)

ii)
State two advantages and two disadvantages of using a sphygmomanometer to

measure blood pressure rather than invasive methods.

(2 marks)

Section B.
Answer only one Question.
4.
a)
draw labeled diagrams to show how the potential at:-
i)
The
surface
of
the
heart.
(4
marks)

ii)
The surface of the body changes each time the heart beats. (4 marks)

b)
i)
Explain why it is essential for an ECG amplifier to have a high in put

impendence.

(6 marks)
ii)
State
three
further
essential
characteristics of an ECG amplifier, giving

a reason why each characteristics is essential.

(6 marks)

5.
a)
A thermo graphics scanner is used to obtain a thermal image of the body.

i)
Explain why such an image can be useful in medicine.
(6 marks)

ii)
With the aid of a diagram, describe how such an image is obtained.

(6 marks)

b)
Describe the principle of a Doppler ultrasound system used to measure the
speed
of
blood
in
an
artery.
(8
marks)
Page 1 of 8

Medical Physics I Question Paper

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