Tomosynthesis

Tomosynthesis - making the invisible visible. New version provides enhanced clinical versatility.

Tomosynthesis is a proven X-ray imaging technology for higher precision diagnoses. In a simple and quick workflow, and at a low exposure dose, tomosynthesis state-of-the-art imaging technology offers high quality multi-slice images to visualize the part which is invisible for conventional plain radiography. Therefore, the technology “Making the invisible visible” is now increasingly spotlighted worldwide.

Tomosynthesis has been popular in mammography modality already but not yet in radiography or fluoroscopy systems. As a pioneer in developing and providing tomosynthesis for RF systems (the first in the world) with the SONIALVISION series for already more than 10 years, Shimadzu has just released the 4th generation, the new SONIALVISION G4. It covers various application features including the latest advancements in tomosynthesis.

 

Tomosynthesis at a glance

The term ”tomosynthesis” merges ‘tomography’ and ‘synthesis’. It is a special type of imaging technology that fuses cone-beam CT reconstruction with digital image processing to produce images of specified cross-sections from a single tomography.

HD Tomosynthesis

One of the new features available today is "High Definition Tomosynthesis". As tomosynthesis processes a huge volume of data, its original data on the X-ray detector have been acquired with 2x2 binning to reduce processing time and display the final tomosynthesis image on the monitor faster. With Shimadzu’s latest imaging technology, the new "High Definition Tomosynthesis" enables the reconstruction of the tomosynthesis image from original images acquired in the 1×1 high definition mode using a 6-inch field-of-view. This new mode can provide tomosynthesis images with even higher spatial resolution and will be very effective to diagnose small areas such as bones in the finger tips etc. in detail, or to detect a very small micro-fracture.

   

Oblique Tomosynthesis

The new Oblique Tomosynthesis feature provides oblique tomographic images reconstructed at any optimal angle up to ±20 degrees laterally or vertically to match the ideal diagnosis angle. This feature is helpful when examining spines, hip joints and other areas that could be difficult to observe by standard horizontal tomographic images parallel to the table-top.

 

 

Low-dose tomosynthesis

Tomosynthesis allows multiple slices of volume data to be observed with a minimized X-ray dose, requiring a single linear tomography stroke acquisition only. By switching the field-of-view and using collimation, X-ray exposure can be reduced to prevent unnecessary radiation exposure outside the area of interest. A new “Low-dose Tomosynthesis” mode is now available to minimize the dose level even further, which makes the system ideal for pediatric use as well.
 

The benefits of tomosynthesis  

Reduction of examination time and X-ray dose Since the images of a specific cross-section can be reconstructed from a single low-dose tomography scan motion only, this technique requires less time and a lower X-ray dose to obtain multiple-slice images than conventional linear tomography.  

The short examination time is very helpful to stressed or immobile patients.  

Position-free tomography

Tomosynthesis by SONIALVISION allows images to be recorded at any angle required for diagnosis. This includes a variety of table angles, also with the patient standing and reverse inclined position to apply gravity, which is not possible with CT scanners. It helps expanding the examination range and possible remedies.  
 

High-resolution images with minimal metal artifacts 

The combination of high-resolution FPD and advanced imaging technology provides tomosynthesis images with excellent resolution, which are highly appreciated in the diagnoses of a micro-fracture, for example.  

Another clinical key benefit of tomosynthesis images is the minimum influence by the metal artifacts that are usually seen on CT images. Therefore, tomosynthesis is nowadays spotlighted in orthopedics for the follow-up diagnosis of patients with metal implants.

 


Fracture diagnosis

Tomosynthesis is hardly influenced by metal artefacts, therefore ideal for orthopaedics

Tomosynthesis is a very low dose application, which can be applied to various clinical fields
 

 

Standing position tomosynthesis image of weight-loaded knee joints

 

Precise fracture diagnosis (Courtesy of Okitama Public General Hospital)

 

Clear visualization for callus formation (Courtesy of Nara City Hospital)

 

 

 
 
 
 
T-smart
Tomosynthesis: Shimadzu Metal Artifact Reduction Technology
 
“T-smart” is the latest and most sophisticated tomosynthesis technology, further enhanced with the iterative reconstruction method. T-smart automatically divides the original projection images into two projection image sets (metal-free projection images and metal-only projection images) by using an advanced metal extraction algorithm. It then performs iterative reconstructions on each of them and finally integrates the two data sets in one, providing a "T-smart" image.
 
 
Further metal artefact reduction
 
T-smart provides even clearer tomosynthesis images suppressing the artefacts around metal objects even further. This application will be of great help in orthopedics especially for patients with metal implants or fixators as it allows a very exact diagnosis of the status of the boundary between bone and implant.
 

 


 

 

 

 

High image quality with low noise
 
Since the reconstruction process is performed without filtering, it improves the visibility of trabeculae, hairline fractures, and other details, even around metal objects, without accentuating noise. Consequently, this allows images to be viewed with even higher image quality.
 
Comparison: Radiographic image left side vs. Tomosynthesis image right side.

 


Courtesy of Sonoda Joint Replacement and Sports Medical Center Clinic

Courtesy of Kanazawa University Hospital

Courtesy of Kanazawa University Hospital

 

 

This technology has been developed for following system solutions:

 

>> Sonialvision G4

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