Heating and the safety of medical
ultrasound, Magnetic Resonance Imaging and Mobile Phones
Francis Duck,
professor at the University
of Bath Royal
United Hospital Bath
BRLSI Wednesday 18th May 2011
Francis Duck
graduated from Nottingham and obtained a PhD
from London University
Ultrasound 2 -
20MHz radio frequency.
·
This
can cause tissue heating via the same mechanism as microwave heating in a
microwave oven. (He did not state this himself)
·
Blood
travels through the capillaries to carry away heat.
[On the speaker:
I find he has a very annoying manner. He
speaks very badly dithering with “um” and “err” to waste time. He also has a
poor rapport with the audience. His presentation is disorganised and the gaps
in his delivery seem as though he is thought disordered.]
The human body
rigorously regulated temperature to +0.1°C and -0.4°C over a 24 hour period.
·
Core
temperature of 43°C would cause death.
·
Exercise
could raise body temperature to over 40°C.
[On the speaker and the talk:
Strange facts and numbers don’t seem to
really tie together very well.
What he said about how MRI works earlier in the talk means I don’t think
he is reliable.
I think he might be depressed. His
attitude is bad – I think he is trying to act like a “quack” a phoney doctor.]
·
Heat
is not a carcinogen
·
Heat
CAN DAMAGE PREGNANCIES!
-
Very
scientifically rigorous data he assures us
[On the speaker and his talk:
One problem with his style is that it is
very watery he isn’t really saying anything and also one does not feel
comfortable sitting back and listening to what he says – one would have better
things to say than him generally on physics. It is really a 1 slide talk. As I
said I was thinking of the ducks going “quack” and how I chased a sitting duck
off its perch on the embankment by the river into waking up and jumping into
the river the other day.]
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