SenoScan FullField Digital Mammography System

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SenoScan Full-Field Digital Mammography System

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SenoScan FFDM
Tuesday September 25, 1202 pm Eastern Time
Press Release SOURCE Fischer Imaging
Corporation Fischer Imaging Receives Final FDA
Approval for Its SenoScan Full Field Digital
Mammography System
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SenoScan System
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SenoScan Tech. Shield Acquisition Station
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SenoScan

• System Design

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The 3 Key Characteristics

• Higher Resolution - 25 50 Micron Pixel size
• Accommodates more women - 21x29cm field of view
• Higher DQE, Lower dose - slot scanning means no
  grid

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SCANNING MOTION OF DETECTOR
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Beam Quality

• High-output Tungsten-Rhenium target
• 8 kW power rating
• 0.3 mm focal spot
• 20 kVp to 45 kVp voltage range
• Pivoting arm
• Collimation to Detector Width
• No grid

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Typical technique

• SenoScan typical technique for the 4.2 cm
  accreditation phantom
• 29 kVp, 160 mA
• (or less than 35 mAs).

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Beam Quality
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Detector Design

• Mechanical parameters
• Scintillator
• Fibre-Optic plate
• CCD operating in TDI mode
• Correlated Double Sampling technology

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Cesium Iodide
221 mm
Fiber Optic Plate
4 CCDs
10 mm
COMPOSITION OF SENOSCAN DETECTOR
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Detector Characteristics

• 4 CCDs, 25 micron native resolution
• 50 micron standard resolution
• 2-D area detector
• Time delay and Integration (TDI)
• CsI for high DQE
• 10 lp/mm at 50 Microns
• 14 lp/mm at 25 Microns

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Detector Design

• Large charge well capacity 2 M electrons
• minimal dead space between CCDs
• Four CCDs butted for 220 mm length
• CCD matrix 400 x 2048 pixels or 200 x 1024
  pixels
• Fibre-optic plate shields CCD from X-rays for
  minimum noise

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Key System Specifications

• 4096 x 5625 matrix, both resolution modes
• Field of view 21cm x 29 cm (standard),
  11cm x 15 cm (high res)
• Scan time five seconds
• Effective exposure time 200 milliseconds
• Two-monitor high resolution diagnostic
  workstation
• Dicom3 compatibility

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SenoScan

• System Performance

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Detector Sensitometric Response
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Detector performance - low exposure
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Spatial Resolution

• More than 5 lp/mm needed
• 70 of DCIS presents as calcifications
• 8 mm average size
• Dershaw 29th NCBC 4/00
• Prevalence of DCIS growing as screening
  prevalence increases
• SenoScan 5o and 25 Micron Pixel Size Valuable
  Screening and Diagnostic Tool

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SenoScan MTF
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Comparative dose, SenoScan vs. FSM
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Detective Quantum Efficiency

• Defined as
• DQE SNR2(image)/SNR2(incident)
• Can be shown to be proportional to
• MTF2(f)/NPS
• Often heuristically described as
• DQE ? (Image Quality) / (Patient Dose)

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Effect of DQE

• Over an ensemble of images a large set of
  mammograms, what is likely to matter is the
  integral of the DQE curve
• So that a measure of system effectiveness is
  given by the area under the DQE curve

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From the DQE equations

• Recall that
• DQE ? (Image Quality) / (Patient Dose)

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Patient Ergonomics

• 200 milliseconds effective exposure time
  (velocity x pixels/column)
• Breast support and paddle design cup the breast -
  reducing chance of motion
• Patient feedback indicates that the curved breast
  support increases comfort for same amount of
  compression

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SenoScan

• Summary

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Unique Features of SenoScan
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