Patient Penetrometer

To check the tabletop output of image-intensified fluoroscopic equipment properly, a simulated body or phantom should be placed between the x-ray output meter and the input phosphor. The phantom protects the phosphor from the direct beam and provides the simulated attenuation needed to check the performance of image-intensifier systems. A penetrometer permits the determination of system contrast gradient under simulated operating conditions.

Consists of:

(a) Two 7'' x 7'' x 3/4'' blocks of high-purity aluminum, which represent the equivalent absorption of 26 cms of water and simulate a thick or heavy-set patient at 90 kVp. A single block is the equivalent of a child or adult chest. Aluminum simulates the scatter characteristics of the human body.

(b) One 7'' x 7'' x 1/8'' lead beam-stop plate. When placed in the beam, this plate allows automatic brightness-control machines to deliver maximum output.

(c) One 7'' x 7'' x 1/32'' aluminum penetrometer plate with 1/4'', 0.176'', 1/8'', 0.088'', 1/16'' holes. Place this plate between the two aluminum blocks and ascertain the contrast gradient of the

penetrometer on image-amplified systems.

(d) Two sets of legs: one 11/4'' long, one 103/8'' long.

Dimensions: 7'' x 7'' x 17/8'' high (17.8 cm x 17.8 cm x 4.7 cm)

Weight: 9.5 lbs (4.3 kg)