The META Scholar Volume 4 | Page 24

Figure 21sows the same array of figure 19 and 20, but the resultant line from the adding action is a straight line along the y axis, the analysis is similar to the one done in figure 7, L6(x)
- L(2), and L(5) – L(3)cancel each other, as these line components are the ones that contribute to the deviation angle, the resultant line is a straight ultrasonic line along the y axis = L2
(x,y) + L3(x,y) + L4(y) + L5(x,y)+ L6(x,y).

Reference
The Physics of Medical Imaging. Steve Webb.IOP Publishing LTD, a Company Wholly
Owned by the Institute of Physics, London. 1992.
The Biomedical Engineering Handbook. Third Edition. Joseph D. Bronzino. © 2006 by Taylor & Francis Group, LLC. CRC Press is an imprint of Taylor & Francis Group
Service manual Aloka SSD 5500. Aloka Ultrasound Systems 2005, 22-1, Mure 6 chome,
Mitaka-Shi, Tokio 181-8622, Japan.
Random Quiz:
Question 1:The transmission focus in the linear probes are obtained by________
a.
b.
c.
d.

adding lines transmitted from the crystals
means of a convex mirror inside the probe
amplifying the transmitted lines
activate all the crystal of the probe

Question 2:To build ultrasound lines in transmission, and the echoes in reception is necessary___________
a.
b.
c.
d.

to modulate the pulses
to delay in time the pulses
to apply a logarithm amplification
to filter the pulses

Question 3:The phase array probes build the sector ultrasound image by_______
a.
b.
c.
d.

steering the ultrasonic lines
sending half of the total line first and another half later
sending the ultrasonic lines with an angle of 45 degree
sending the ultrasonic lines with three focus

Question 4:Enumerate three examples that shows the advantage of the electronic probes over
the mechanic ones._____
______
______
a.
b.
c.
d.
e.

The possibility of move the focus along the image area
The possibility of focusing continuously the reception of echoes
Eliminate the complexity of mechanic devices
Electronic probes are smaller
It is possible to obtain images in B and M mode