Focal Spot Test Tools

Multi-Purpose Focal Spot and
HVL Test Stand

• Can be used for half value layer measurements
• Designed for both over-table and under-table x-ray tube measurements

This versatile stand features extendible legs that provide the enlargement factors required by the NEMA® standard. Long leveling screws allow the positioning of a screen-film cassette under the base.

SPECIFICATIONS
Dimensions 12 x 12" at base; 6.15 x 6.15" at top Height Adjustable from 16.94 to 31.38 inch
Weight 11 lb (5 kg)

07-622 Multipurpose Focal Spot/HVL Test Stand
89-622 Carrying Case
07-611 Pinhole Assembly, 0.100 mm
07-613 Pinhole Assembly, 0.030 mm
07-617 Pinhole Assembly, 0.075 mm
07-633 Pinhole Assembly, 0.010 mm

Focal Spot Test Tool

The Focal Spot Test Tool provides a simple “passfail” test to determine if an x-ray tube focal spot has been damaged. Consists of a 6 inch high stand with an eleven-group test pattern.

Each group has six bars, three of which are positioned at right angles to the adjacent set. The groups diminish in size from 0.66 line pairs/mm (1.75 mm) to 2.88 line pairs/mm (0.3 mm). By observing the radiograph and using the supplied chart, showing resolution vs. focal spot size, the nominal focal spot dimension (in mm) can be determined.

SPECIFICATIONS
Dimensions (Stand) 6.35 cm Ø x 15.24 cm H (2.5 in Ø x 6 in H)
Weight 0.11 kg (0.25 lb)

07-591 Focal Spot Test Tool

X-Ray Pinhole Assemblies

In order to determine the focal spot size of an
x-ray tube, a small and precise X-Ray Pinhole Assembly is often used. Its size must be very small compared to the focal spot to be measured.