Imaging System Hardware
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33
rating an instrument one must consider the range over which its response remains
linear. For the GenePix scanner, the dynamic range is 10
4
.
The dynamic range of an instrument is often considered in conjunction with its
detection limit. The detection limit is defined as the dye concentration for which
the signal-to-noise ratio = 3. Signal-to-noise ratio is calculated as:
(Signal – Background) / Standard Deviation of Background
Although you may be able to see features below this level, the quantitative accuracy
diminishes significantly.
Specifications
Sample type:
Standard microscope slides (1" × 3", 25 × 75 mm,
26 × 76 mm; 0.9–1.1 mm thick)
Maximum scan area:
22 × 69 mm
Maximum resolution: 5
µ
m
Scan mode and order: Sequential; fully user-configurable scan order
Detector:
Photomultiplier tube (PMT)
Digital resolution:
16-bit
Image format:
Single-image or multi-image TIFF
Computer interface:
SCSI (adapter included)
Scan time:
Four minutes per channel for full size scan area at 10-
µ
m
resolution
Dynamic range:
Four orders of magnitude
Field Uniformity:
Less than ± 5% non-uniformity
Dimensions:
43 cm (16.9") × 65 cm (25.6") × 34 cm (13.4") (W×D×H)
Power supply:
Line voltage: 85 to 264 VAC (110 to 340 VDC) universal
voltage input
Line frequency: 50–60 Hz
Power: 150 W / Fuse: 2.0 A slow .5 × 20 mm
Chapter 4