Resurrecting dinosaurs with medical scanners and 3D printers

CT scans and 3D printers are making it possible to see fossils that were previously inaccessible inside rock.

Accurate copies of fossilised bones can now be made from the combined use of computed tomography (CT) scans and 3D printers, according to a paper published in the journal Radiology.

The technique offers scientists a non-destructive way of transporting and handling rare or fragile fossils.

To protect such specimens from damage during transportation, the fossils are often stored in plaster jackets or casts. These jackets must be strong enough to protect the fossils, but should also separate easily from the specimen when removed.

It is during the removal of the plaster and surrounding sediment that the fossil is in danger of material loss or even destruction. This typically occurs when the plaster is stuck fast to the bone.

(A 3D print of a fossil (right) next to the original still inside a plaster jacket. Image: Courtesy of Radiology and RSNA)

A group of German researchers found that, by using CT and 3D printers, they could separate fossilised bone from its surrounding sediment matrix in a way that would not harm the specimen, then produce a 3D copy of it.

Applying this method to an unidentified fossil from the Museum für Naturkunde in Berlin, the researchers scanned the bone with a 320-slice multi-detector system to show up the different attenuation (absorption of radiation) through the bone and the surrounding sediment matrix, depicting clearly the fossilised vertebra.

The scan also provided information on the condition and integrity of the specimen, like otherwise unknown fractures, and helped the researchers build an accurate reconstruction of the fossil.

Then using a laser sintering system – a process which uses high-powered lasers to fuse materials by adding thin horizontal layers of plastic – an accurate 3D copy of the fossil was produced.

(An enlarged 3D copy of a 380 million year old coelacanth skull found near Fitzroy Crossing, Western Australia. Image: John Long)

The impact on palaeontology
According to Richard Brian Gunderman, a professor of radiology at Indiana University who was not involved in the study, CT scanners are able to determine the exact structural dimensions of an object, down to fractions of a millimetre.

This data can then be used to construct a replica so precise that objects of great historical interest, like Stradivarius violins, have been created to sound remarkably similar to the originals.

“Such a technology has been a boon to palaeontologists in the past few years,” said John Long, strategic professor in palaeontology at Flinders University.

“Once we relied on meticulous time-consuming methods to prepare delicate fossils out of the rock and, even then, we could only see their external features. Now, using high-resolution micro-CT scanners and synchrotrons [particle accelerators], we can investigate every nook and cranny of the fossil right down to individual cells and tissue structures without having to risk damaging the specimen.

“Combined with advanced 3D printing, we can now slice though the ancient fossil skulls and print them in halves showing the full anatomy in clear definition. This will no doubt revitalise palaeontology.”

(A 3D scan of a 380 million-year-old Gogonasus fish skull by Tim Senden and ANU Vizlab.)

Ahi Sema Issever, from the Charité Campus Mitte in Berlin and one of the study’s authors, explained: “The most important benefit of this method is that it is non-destructive so the risk of harming the fossil is minimal. In addition, not only does this method allow for a global exchange of rare fossils in any quantity, data on the specimens can also be digitally shared between research institutes, museums and schools while protecting the original fossil.”

Darren Curnoe, associate professor at the University of New South Wales, agreed, saying: “Famous fossils like the Taung Child in South Africa - the very first ancient ape-like creature found in our human evolutionary tree - has been quite badly damaged following almost 90 years of study by scientists.

“Almost everyone who sees the fossil wants to take a couple of measurements of their own, and by doing so, is damaging these priceless pieces of our collective heritage. We need to do better, and such technology might just be the answer.”

A note of caution
Although supportive of the technological breakthrough in this study, Professor Long warned that researchers must not rely too heavily on tomographic imagery and 3D printing to draw their conclusions.

“It is important to carefully study the preservational biases of the original fossil first to determine how reliable a computer-generated image will be. In some cases, replacement of bone by other minerals or the presence of solid inclusions can effect the quality of CT images and affect 3D printing results.

“Scientists still need to study the original specimens in detail first, and then make interpretations using CT tomography and 3D printing.”

(A scanned 400 million-year-old placoderm eye capsule found in Taemas near Canberra. Image: Tim Senden)

Associate Professor Curnoe agreed, saying: “Any model made from CT scans must properly distinguish actual bone from missing bone, or even from materials like plaster, that had been used in the past to reconstruct missing bones in the fossils. This is particularly important since most fossils found are incomplete or distorted.

“In the end, there is nothing like seeing the real thing to fully understand the anatomy and the state of preservation of a fossil. But, for the sort of work many scientists do, especially postgraduate students, 3D models would be incredibly useful at a time when funding can be very hard to get.”

Beyond fossils
Some experts speculate that the findings from this study will benefit the medical field, like building and fitting implants in orthopaedic surgery. Others feel that the technique could be used to model real bones and other tissues, such as cadavers that have been preserved in ice or peat bogs.

Martin Baumers, a research fellow at the University of Nottingham, would like to see the implementation of a virtual library and data infrastructure for such 3D data and designs. He believes that it would aid collaborative research, allowing experts from different disciplines to share and retrieve 3D models for 3D printing or other scientific, even commercial, usage.

For Professor Long, the biggest breakthrough will come when palaeontologists possess the ability to make portable machines to take into the field and scan fossils, still buried under the rock layers, to determine the full extent of the fossil before excavating it.

This article was originally published at The Conversation. Read the original article.The Conversation

A scan of a 380million-year-old tooth from a fossil shark. (Image: Tim Sendon)
Azeem Ward
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Living the Meme: What happened to Azeem Ward and his flute?

In the first of a new series investigating what happens to people after they become memes, we speak to Azeem Ward, whose flute recital went viral in 2015.

The Sixties had Woodstock. The Nineties had Lollapalooza. The Tens – and, if we’re being honest, just a single year of them – had Azeem's Senior Flute Recital.

If you were inactive on the internet between 12 and 16 May 2015, you’ll be forgiven for not knowing who Azeem Ward is. After setting up a Facebook page for his end of year flute performance, the University of California student was inundated with over 100,000 RSVPs from the United Kindom, along with multiple requests to fly to England and play (for no apparent reason) Darude’s “Sandstorm” in Nando’s. After international news coverage, Ward – as all memes inevitably do – appeared on Jimmy Kimmel Live! to discuss his newfound fame. On 16 May, he had to turn hordes of people away from the 500 seat recital hall, and over 55,000 individuals tuned into a livestream of the event. Then, Ward disappeared. Not from social media, and not from the world, but from the internet’s collective consciousness.

Search interest in "Azeem Ward" over time

“I’d say no,” answers Ward, when I ask him whether, one and a half years later, he still receives any special attention or has any fan interactions. “I’m just regular Azeem now, and I’m okay with that. Regular me is a more focussed person that is not reacting to things that are happening around me.”

Ward is Skyping me from his home in Iowa, where he is getting his master’s degree in flute performance. He spends his time composing flute beatbox songs, learning how to produce music, and teaching a class on flute fundamentals at the university. “A lot of [the students] here in Iowa know what happened but they don’t go like: ‘Oh my God! It’s Azeem!’. It’s just like, ‘Hey, what’s up man? I saw that one thing about you on Jimmy Kimmel’.”  

The original Facebook event page

Ward regained his anonymity when he moved to Iowa, as many of his fellow undergraduate students in California recognised him because he was on the local news. “But the whole viral thing was a UK thing,” he explains, “It wasn’t really around the whole US.”

An Azeem meme

Four months after his famed flute recital, Ward did come to the UK and toured the country to perform as part of various university freshers’ weeks. “That was a crazy time,” he says, “I was over there for five weeks and played 22 shows in 12 different cities, all the way from London to Scotland.” His concerts were popular, though most people came to take a selfie or ask about how the recital happened, and only a few wanted to talk to him about music. Still, Ward profited from the events. “We did make some pretty good money," he says, admitting he earnt around $5,000. 

Despite clearly enjoying this time, Ward seems unfazed that his viral fame is now over. His only regrets, he says, are that he didn’t make any connections in the music business while in the UK, and that he didn’t have any social media accounts set up before he went viral, so there was nowhere for people to go to listen to his music. “When you go viral people hold onto that rather than taking you seriously as a musician,” he says. “Sometimes it annoyed me but sometimes I realised that I wouldn’t be there in the first place if it wasn’t for going viral.”

Azeem now, photo courtesy of Azeem Ward

So what advice would Ward give to the next person who finds themselves, unwittingly, the object of the internet’s affection?

“I'd say don't lose sight of what you've already been doing in your life, like keep your focus. I'd say that sometimes in your head you're like ‘Oh man, I have to do this now’, but you've just got to stay focussed on your goals. When you have your own path and you go viral you have a lot of people asking you to do all these different things. It was pretty intense – I’m not used to having a lot of people look at me and my actions, so I was pretty anxious at first. In the end I realised that I came to do what I came to do, and I had to go do it.”

Although Ward doesn’t miss being internet-famous, it is clear that going viral had an impact on him. He recalls the peak of the madness with telling clarity, sharing specific details such as "256 people” clicked attending in "four hours", and “then 512”, before 12,000 people RSVP’d overnight. Mostly, however, he seems very grounded, though he acknowledges it was “out of control” and “really crazy”.

Perhaps Ward feels this way because he received little in the way of negativity or hate. He fondly discusses memes that were created and art that was drawn about him, and the support of his family and friends. “Even though there were a lot of silly things going on, I managed to make it positive for the school,” he says. “I had no haters. Everyone was like ‘Damn, Azeem. Good job, man’.”

One day, Ward hopes to come back to London, although he is wary of returning. Not because of his viral fame, nor the number of selfies he might have to take with Nando's customers, but because of Brexit. Our conversation, like all post-June conversations, turns swiftly to the topic, and Ward asks me about the economy. “I was thinking about trying to do a doctorate over in London, but if things aren't going to be so good in a few years...” 

Ward admits he wouldn’t be bothered if he never went viral again. “When I think of something going viral, I think it has a point in time where there’s so much interest and then it goes away. I’d like to produce material and the attention to keep going up.” So do you want to be famous, I ask? “Do I really want to be famous?” he ponders. “Being famous is okay, I guess. But I want to be is respected and appreciated.”

To listen to Azeem’s music visit or Like his Facebook page.

To suggest an interviewee for Living the Meme, reach out to Amelia on Twitter.

Amelia Tait is a technology and digital culture writer at the New Statesman.