engineering

Godfrey Hounsfield

Godfrey Hounsfield is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Godfrey Hounsfield rather than just read about it. In short: Sir Godfrey Newbold Hounsfield ( HOWNZ-feeld; 28 August 1919 – 12 August 2004) was a British electrical engineer who shared the 1979 Nobel Prize for Physiology or Medicine with Allan MacLeod Cormack for his part in developing the diagnostic technique of X-ray computed tomography (CT). His name is immortalised in the Hounsfield scale, a quantitative measure of radiodensity used in evaluating CT scans.

Key takeaways

Godfrey Hounsfield belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Godfrey Hounsfield to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Godfrey Hounsfield from memory before moving on to harder problems.

Reference excerpt

Sir Godfrey Newbold Hounsfield ( HOWNZ-feeld; 28 August 1919 – 12 August 2004) was a British electrical engineer who shared the 1979 Nobel Prize for Physiology or Medicine with Allan MacLeod Cormack for his part in developing the diagnostic technique of X-ray computed tomography (CT). His name is immortalised in the Hounsfield scale, a quantitative measure of radiodensity used in evaluating CT scans. The scale is defined in Hounsfield units (symbol HU), running from air at −1000 HU, through water at 0 HU, and up to dense cortical bone at +1000 HU and more.

Early life Hounsfield was born in Sutton-on-Trent, Nottinghamshire, England on 28 August 1919. He was the youngest of five children (he had two brothers and two sisters). His father, Thomas Hounsfield was a farmer from Beighton, and was linked to the prominent Hounsfield and Newbold families of Hackenthorpe Hall, his mother was Blanche Dilcock. As a child he was fascinated by the electrical gadgets and machinery found all over his parents' farm. Between the ages of eleven and eighteen, he tinkered with his own electrical recording machines, launched himself off haystacks with his own home-made glider, and almost killed himself by using water-filled tar barrels and acetylene to see how high they could be waterjet propelled. He attended the Magnus Grammar School in Newark-on-Trent, but was not academic.

Military service and education Shortly before World War II, he joined the Royal Air Force as a volunteer reservist where he learned the basics of electronics and radar. After the war, he attended Faraday House Electrical Engineering College in London, graduating with the DFH (Diploma of Faraday House). Before the advent of most university engineering departments, Faraday House was a specialist Electrical Engineering college that provided university level education that combined practical experience with theoretical study.

Career

In 1949, Hounsfield began work at EMI, Ltd. in Hayes, Middlesex, where he researched guided weapon systems and radar. (Hounsfield incorrectly gave this date as 1951 when he wrote his autobiography which is available on the Nobel Prize website; the correct date is 10 October 1949 as stated in a biography of Hounsfield.) At EMI, he became interested in computers and in 1958, he helped design the first commercially available all-transistor computer made in Great Britain: the EMIDEC 1100. Shortly afterwards, he began work on the CT scanner at EMI. He continued to improve CT scanning, introducing a whole-body scanner in 1975, and was senior researcher (and after his retirement in 1984, consultant) to the laboratories. While on an outing in the country, Hounsfield came up with the idea that one could determine what was inside a box by taking X-ray readings at all angles around the object. He then set to work constructing a computer that could take input from X-rays at various angles to create an image of the object in "slices". Applying this idea to the medical field led him to propose what is now known as computed tomography. At the time, Hounsfield was not aware of the work that Cormack had done on the theoretical mathematics for such a device. Hounsfield built a prototype head scanner and tested it first on a preserved human brain, then on a fresh cow brain from a butcher’s shop, and later on himself. On 1 October 1971, CT scanning was introduced into medical practice with a successful scan on a cerebral cyst patient at Atkinson Morley Hospital in Wimbledon, London, United Kingdom. In 1975, Hounsfield built a whole-body scanner. The principles of computed tomography developed by Hounsfield remain in use today (2022).

Awards and honours In 1979, Hounsfield and Cormack received the Nobel Prize in Physiology or Medicine. Hounsfield received numerous awards in addition to the Nobel Prize. He was appointed Commander of the Order of the British Empire in 1976 and knighted in 1981. In 1974, he received the Wilhelm Exner Medal. Hounsfield was elected a Fellow of the Royal Society (FRS) in 1975. In 1976, he received the Golden Plate Award of the American Academy of Achievement. He was awarded the Howard N. Potts Medal in 1977. In 1994 he was elected an Honorary Fellow of the Royal Academy of Engineering. The Hounsfield Facility for 3-D CT imaging at the University of Nottingham, opened in 2014, was named after him. It was designed to apply CT scanning to biomaterials, especially within soil, and thus to the exploring the environment.

Personal life and death Hounsfield enjoyed hiking and skiing. He had resolved to develop what came to be CT scanning while on a country ramble. He retired from EMI in 1986 and used the prize money from his Nobel to build a personal laboratory in his home. Hounsfield died at Kingston upon Thames, Greater London, in 2004, at the age of 84.

References

External links Godfrey N. Hounsfield on Nobelprize.org

Illustrations

Worked examples

Example 1 — a first encounter with Godfrey Hounsfield

Start with the simplest possible case. Write down what Godfrey Hounsfield claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Godfrey Hounsfield before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Godfrey Hounsfield ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Godfrey Hounsfield

In research: Godfrey Hounsfield appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Godfrey Hounsfield in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Godfrey Hounsfield is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1919 births, 2004 deaths, 20th-century British physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Godfrey Hounsfield outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Godfrey Hounsfield in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Godfrey Hounsfield means in your own words.
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Frequently asked questions

What is Godfrey Hounsfield in simple terms?

Why does Godfrey Hounsfield matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Godfrey Hounsfield?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Godfrey Hounsfield.