News | April 09, 2015

CT Scans Offer New Insights into Extinct Marine Creatures

German research uses CT to reveal ammonites were probably able to swim

April 9, 2015 — Using state-of-the-art imaging techniques, paleontologists at the Ruhr-Universität Bochum (RUB) have been examining extinct marine creatures. Quantitative analyses provide new evidence that ammonites were able to swim using their shell - very much like the recent nautilus. For the purpose of the study, the researchers, together with partners from the industry, developed an evaluation process for high-resolution computed tomography (CT) images. The science magazine "RUBIN" reports about the results.

Ammonites had a visceral mass that was protected by a helical shell with several chambers. One theory postulates that the creatures lived at the bottom of the sea. Another claims that they were able to swim by using their shell with its gas-filled chambers to compensate for the weight of their shell and soft body, rendering them neutrally buoyant. Together with his team, RUB researcher René Hoffmann, Ph.D., investigated how much buoyancy an ammonite shell could generate. First, the palaeontologists from Bochum developed a reliable evaluation technique for their CT images, using the nautilus shells as a test object. Their method now enables them to precisely ascertain the volumes of the examined shells and to calculate their weight, as well as the volumes of the gas-filled chambers. The data thus gathered indicate the buoyancy generated by the shell. In order to clarify if the ammonites were able to swim, the researchers need to know if their shell provides sufficient buoyancy to compensate the weight of the visceral mass and the shell. They estimated the latter, basing it on observations of the nautilus animal.

For the CT analysis, Hoffmann needed hollow fossilized ammonites. In order to find them, he traveled to Russia and Japan, among other countries. Together with Ph.D. student Robert Lemanis, he analyzed a 0.98-millimeter-large ammonite hatchling. The result: Three to five gas-filled shell chambers would have been sufficient to enable the ammonites to swim freely in the water directly after hatching. The examined shell had 11 chambers. How many of them existed in the moment of hatching, however, cannot be ascertained — the larger the mollusks became, the more chambers they created. Still, the RUB analyses showed that the hatchling would not have been condemned to dwelling at the bottom, even if only one chamber had been filled with gas; using active swimming motions, the young ammonite would have been able to move around freely in water and stop itself from sinking.

For more information: www.rubin.rub.de/en

Related Content

Researchers Awarded 2018 Canon Medical Systems USA/RSNA Research Grants
News | Radiology Imaging | November 13, 2018
The Radiological Society of North America (RSNA) Research & Education (R&E) Foundation recently announced the...
The Fujifilm FCT Embrace CT System displayed for the first time at ASTRO 2018.
360 Photos | 360 View Photos | November 07, 2018
Fujifilm's first FDA-cleared compu...
MaxQ AI Receives FDA Clearance for Accipio Ix Intracranial Hemorrhage Platform
Technology | Artificial Intelligence | November 07, 2018
MaxQ AI announced that its Accipio Ix intracranial hemorrhage (ICH) detection software has received 510(k) clearance...
GE Healthcare Discovery RF Gen 2 system displayed at ASTRO 2018. It is a dedicated computed tomography (CT) scanner for radiation oncology
360 Photos | 360 View Photos | November 07, 2018
This is the GE Healthcare Discovery RF Gen 2 system displayed at the ...
Results of the vertebrae-based analysis (383 vertebrae in 34 patients) for detection of BME.

Results of the vertebrae-based analysis (383 vertebrae in 34 patients) for detection of BME.

Sponsored Content | Case Study | Computed Tomography (CT) | November 06, 2018
The following is a summary of a study published in the
The NeuViz 16 Essence from Neusoft Medical Systems.

The NeuViz 16 Essence from Neusoft Medical Systems.

Feature | Computed Tomography (CT) | November 05, 2018 | By Melinda Taschetta-Millane
According to an industry mark...
Carestream Spotlights Healthcare IT and Imaging Systems at RSNA 2018
News | Information Technology | October 31, 2018
Carestream announced it will be displaying several imaging and healthcare information technology (IT) offerings at the...
IMRIS, Siemens Strengthen Collaboration in Hybrid OR Neurosurgical Market
News | Hybrid OR | October 24, 2018
IMRIS, Deerfield Imaging, in partnership with Siemens Healthineers, announced a strengthened collaboration to advance...
Fujifilm Unveils FCT Embrace CT System for Oncology
Technology | Computed Tomography (CT) | October 23, 2018
Fujifilm Medical Systems U.S.A. Inc. recently introduced the FCT Embrace computed tomography (CT) system. Powered by...
The Aquilion Precision CT system from Canon offers very high resolution imaging, which may aid in cancer detection and improved treatment planning in radiation oncology. #ASTRO2018 #ASTRO #ASTRO18

The Aquilion Precision CT system from Canon offers very high resolution imaging, which may aid in cancer detection and improved treatment planning in radiation oncology. 

News | Computed Tomography (CT) | October 19, 2018
October 19, 2018 – At the 2018 American Society of...