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FIRST

FIRST / Forward Projected Model-Based Iterative Reconstruction optimized for routine clinical application for immediate implementation. Another first from Toshiba.
FIRST -
Forward projected model-based Iterative Reconstruction SoluTion

For the adoption of FIRST into routine clinical scanning, Toshiba Medical understands that workflow cannot be compromised, that image quality must be immediately familiar, and that the dose reduction benefi ts must be automated. Quite simply, advanced iterative reconstruction should not be a technological challenge, but a technology that fits seamlessly into daily clinical practice.

Following Toshiba Medical’s long-standing philosophy of minimizing dose, FIRST:

  • Integrated into SUREExposure™ to ensure automatic dose reduction of up to 82.2%*1
  • Requires as little as 3 minutes*2 for full volumetric reconstruction
  • Reconstructs in parallel with InstaView™ realtime reconstruction
  • Delivers unsurpassed natural-looking image quality due to anatomical modeling

FIRST Integrated / Lower Patient Doses Increased Diagnostic Accuracy Another fi rst from Toshiba

  • *1 : In clinical practice, use of FIRST may reduce the CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. Please consult with a radiologist and a medical physicist to determine the appropriate dose for obtaining diagnostic image quality in the particular clinical task.
  • *2 : Typical standard body protocol for volume scan (320 images).

FIRST

FIRST Explained Simply

In FIRST, reconstruction from the original (measured) projection data is performed with traditional FBP to create a seed image. This image then undergoes forward projection to create a forward projected dataset (essentially a projection summation of HU values along each ray path projection). The forward projection data is then compared with the original projection data to identify the differences between the two. This essentially identifies errors in the FBP reconstruction, which are compensated for. A subsequent correction step is then performed to update the seed image. This is a sophisticated process because additional information concerning the focal spot size (Optics Model), photoelectric noise (Statistical Model), the conebeam trajectory (Conebeam Model), and the exact scan parameters (System Model) are utilized in the update process.

This process is iteratively repeated until the differences between the original (measured) projection data and the forward projection data are minimal, ensuring that a highly accurate image of the patient is produced with increased spatial and low contrast resolution. Since this process is coupled with anatomically based noise regularization, FIRST is incredibly robust for data with extremely low photon counts, which translates to an opportunity to significantly reduce the radiation dose in all examinations.

Carotid artery stent

Carotid artery stent

Scan
Mode
Contrast Collimation Pitch kVp mAs Rotation
Time (s)
Ultra Helical CE 0.5 mm x 80 Standard 120 SUREExposure 3D 0.5
Scan Range
(mm)
Dose
Reduction
CTDIvol
(mGy)
DLP
(mGy・cm)
Effective
Dose (mSv)
k  
295 FIRST 16.3 527.1 3.1 0.0059  

Courtesy Hiroshima University Hospital


Ground-glass nodule

Ground-glass nodule

Scan
Mode
Contrast Collimation Pitch kVp mAs Rotation
Time (s)
Ultra Helical - 0.5 mm x 80 Fast 120 5 0.5
Scan Range
(mm)
Dose
Reduction
CTDIvol
(mGy)
DLP
(mGy・cm)
Effective
Dose (mSv)
k  
390 FIRST 0.3 15.1 0.2 0.014  

Courtesy Hiroshima University Hospital


Low-dose hepatic tumor

Low-dose hepatic tumor

Scan
Mode
Contrast Collimation Pitch kVp mAs Rotation
Time (s)
Volume CE 0.5 mm x 320 - 80 SUREExposure 3D 0.5
Scan Range
(mm)
Dose
Reduction
CTDIvol
(mGy)
DLP
(mGy・cm)
Effective
Dose (mSv)
k  
160 FIRST 3.4 54.5 0.82 0.015  

Courtesy Hiroshima University Hospital


High Contrast Phantom: FBP vs. FIRST (200 mAs)

Low Contrast Phantom: FBP vs. FIRST (50 mAs)

Due to local regulatory processes, some of the products shown at this web page may not be available in each country.
Please contact your local Toshiba Medical sales representative for the most current information.