11. CALLIMATOR
• Made of a large
number of small
holes drilled in a
plate of lead.
• Provide the right
direction.
• Scatter radiation
absorbed by septa.
15. PHOTOMULTIPLIER TUBES (PMT)
Following the light
guide.
photocathode converts
light photons into
electrons.
electrons amplified
through many dynodes.
The final electrons
cluster is collected at the
anode
anode converts them
into electrical signals.
16. PRE- AMPLIFIER & AMPLIFIER
Pre- amps attach above the
PMT.
The amount of charge given by
PMT is very small. Even though
we have used a sophisticated
photo detector like a PMT we
still end up with quite a small
electrical signal.
A very sensitive amplifier is
therefore needed to amplify this
signal. This type of amplifier is
generally called a pre-amplifier.
After that use amplifier to
amplify the signal as need.
17. POSITION LOGIC
CIRCUITS
Position circuitary
receive the electrical
impulses from the tubes in
the summing matrix
circuit (SMC).
This allows the position
circuits to determine
where each scintillation
event occurred in the
detector crystal.
PULSE HEIGHT
ANALYZER
The amplitude of each
electrical pulse from the
amplifiers is measured
in the electrical circuits
of the pulse-height
analyzer
Peak height analyzer
and a computer convert
the light into a useful
anatomical image
18. DATA ANALYSIS COMPUTER
A processing computer is used to deal
with the incoming projection data and
processes it into a readable image of the 3D
spatial distribution of activity within the
patient.
The computer may use various methods to
reconstruct an image, such as filtered back
projection or iterative reconstruction
19. GANTRY
A gamma camera system
attached with gantry.
All circuits and motors
related to movement
(longitudinal, rotational,
up & down)of gamma
camera placed in gantry.
gantry
25. THERAPEUTIC
Designed to deliver therapeutic dose of
ionizing radiation to specific disease site,
such as cancerous tumors, with high
specificity in the body.
Historically, used to treat Thyroid cancer,
Graves’ disease, hyperthyroidism, and
bone pain pallitation associated with
skeletal metastasis.
26. DIAGNOSING
Used to derive detailed
description of the morphology
and dynamic functioning of the
various internal organs of the
body.
30. Studies of the brain and central nervous
system.
Cardiac imaging.
Skeletal imaging.
The respiratory system.
Liver/spleen imaging.
The endocrine system