EDGE DetectorTM

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The Ultimate Small Field Dosimeter

EDGE Detector is a waterproof dosimeter with a design that nearly eliminates the convolution of high dose gradient regions during profile and depth measurements. It is intended for measurement of fields as small as 5 mm up to 10 x 10 cm.

  • EDGE Detector is waterproof
  • Use for SRS and IMRT beam modeling, and TPS Commissioning
  • SunPoint® Diode Detector technology
    • 800 times smaller than micro ionization chambers
    • 100 times more signal than micro ionization chambers
  • Small size ideal for accurate penumbra characterization and steep gradients
  • Works with all common water phantoms
  • EDGE Detector is waterproof
  • Use for SRS and IMRT beam modeling, and TPS Commissioning
  • SunPoint® Diode Detector technology
    • 800 times smaller than micro ionization chambers
    • 100 times more signal than micro ionization chambers
  • Small size ideal for accurate penumbra characterization and steep gradients
  • Works with all common water phantoms
Edge Detector combined_charts

Output factors measured for CyberKnife® beams at Dmax (6 MV)1

The EDGE Detector agrees with EBT film; even for the 5 mm cone. The ion chambers clearly underestimate the output factors of the small beams.

PDD curves measured by different detectors for a 2 x 2 cm field (6 MV)1

The PDD curve measured by EDGE Detector agrees with those of the ion chambers.

EDGE Specification Comparison

Detector Typ

SunPoint® Diode Detecto

Typische Raster-Ionenkammer

Breite (mm):

0.8

2.0

Dicke (mm):

0.03

2.0

Länge (mm):

0.8

5.0

Volumen (mm3):

0.019

16.0

EDGE Penumbra Comparison

Field SizeEnergyPenumbra measured (mm) at 10 cm depth
(cm x cm)
(MV)EDGEPinPoint
2 x 262.93.9
184.44.9
10 x 1064.45.6
185.56.9

Active Detection Area (mm):
0.8 x 0.8
0.3 from top
4.72 from end
Diode Die Location: (mm): 2.7 from side Location is indicated by cross hairs on top of the housing
Water Depth Equivalent (mm): 0.5
Housing Wall Thickness (mm): 0.13 brass
External Dimensions (mm): 3.8 x 5.5 x 38
Nominal Sensitivity (nC/Gy): 32.0
Impedance (Mohm): >200 at 10 mV reverse bias/td>
Output Polarity: Negative
Cable: 3.4 mm dia. x 1.8 m long, triax
Cable Connector: BNC or TNC triax, or adapters upon request

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