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Rigid Rulers

Medical Sources, Radioactive Sources

Rigid Rulers are compact radioactive measurement markers used during SPECT imaging to define anatomical locations and estimate organ size.

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Eckert & Ziegler

Rigid Rulers Description

The Rigid Ruler consists of a plastic tube measuring 0.197" (5 mm) in diameter and containing 15 alternating 0.394" (10 mm) sections of Co-57 and inactive lead. This segmented design creates a distinct ruler pattern visible on SPECT images, allowing clinicians to estimate organ dimensions and identify anatomical landmarks. The ruler has an overall length of 6.7" (17 cm) with an active length of 5.91" (15 cm) and is supplied with a nominal activity value of ±15%.

Typical Applications
SPECT imaging studies
Organ size measurement
Anatomical landmark localiSation
Patient positioning
Nuclear medicine image correlation
Clinical and research imaging procedures

Rigid Rulers Key Features

  • Designed for anatomical localization during SPECT studies.
  • Assists with organ size estimation and measurement.
  • Contains alternating sections of Co-57 and inactive lead.
  • Includes 15 alternating 10 mm active and inactive segments.
  • Plastic tube construction with a diameter of 0.197" (5 mm).
  • Overall ruler length of 6.7" (17 cm).
  • Overall ruler length of 6.7" (17 cm).
  • Suitable for patient orientation and anatomical correlation.

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