P09052: Molecular Imaging System Upgrade
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Phantom Image Captures

Table of Contents

Phantom Image Captures: Zoom Extreme Experiment

May 7th, 2009

Using the prototype system, phantom images were captured at the zoom extremes of the system as a means to test the range of spatial frequencies which can be generated by the prototype using the Computar lens.

Four different configurations were tested as the image distance and the zoom of the lens was adjusted. The lens can be finely zoomed between 'near' and 'far', and it was set between the maximum near setting and the maximum far setting for this experiment. The configurations used are summarized in the table below.

Configuration Lens Setting Image Distance
1 MAX FAR SHORTEST
2 MAX NEAR SHORTEST
3 MAX FAR LONGEST
4 MAX NEAR LONGEST

Constants for the experiment include:

Ruler Image

public/Camera Settings 050709.bmp

Optigrid Warm Up Routine

The Optigrid was warmed up per the routine used in previous experimentation and documented in the Calibration Routine Document v2.

Optigrid Calibration Routine Document v2(doc)

Captured Images

We were able to achieve spatial frequencies of 1.06 lines/mm in the MAX NEAR - SHORTEST configuration and 0.8 lines per mm in the MAX FAR - NOT CLOSE configuration. Downloadable Images in raw TIF format can be found below.

MAX NEAR - SHORTEST

MAX NEAR - SHORTEST - 20 V

MAX NEAR - SHORTEST - 48.45 V

MAX NEAR - SHORTEST - 74.22 V

MAX FAR - SHORTEST

MAX FAR - SHORTEST - 20 V

MAX FAR - SHORTEST - 48.45 V

MAX FAR - SHORTEST - 74.22 V

MAX NEAR - LONGEST

MAX NEAR - LONGEST - 20 V

MAX NEAR - LONGEST - 48.45 V

MAX NEAR - LONGEST - 74.22 V

MAX FAR - LONGEST

MAX FAR - LONGEST - 20 V

MAX FAR - LONGEST - 48.45 V

MAX FAR - LONGEST - 74.22 V