Dunlee manufactures replacement X-ray tubes compatible with CT scanners from most major OEMs. These tubes are meticulously engineered to be form, fit, and function replacements and tested to ensure proper operation thereby providing dose and diagnostic image quality within system specifications and that any radiologist would demand.

Over the past year, GE has introduced a warning into their CT systems that states that the "Dose may vary" when a non-GE tube is installed. Many doctors, radiation physicists, and hospital administrators have expressed concern about their patient's dose. To answer this concern, Dunlee has sponsored a study by an independent hospital physicist to measure and evaluate the use of Dunlee tubes on GE CT systems. The following are excerpts from that White Paper regarding the Equivalence of Dose.

The objective is to determine whether or not the DUNLEE CT replacement X-ray tube delivers a dose (CTDI100) within the published GE specifications for its own CT scanners equipped with the comparable GE x-ray tube, including both the GE VCT™ and GE LightSpeed™-16 scanners.
Testing was performed on 3 GE VCT scanners using Dunlee Reevo 240G X-ray tubes and on 3 GE LightSpeed 16 scanners using Dunlee DA200 Ultra X-ray tubes.

The measured values of CTDIvol for each of the three Dunlee (Reevo) equipped VCT scanners agree with the values obtained from the published data in the GE tech manual, all falling well-within the ±15% tolerance. In fact, all are within about ±5% of the GE expected dose published in the tech manual with the blue dashed lines shown in fig. 1 representing a ±5% variation from the GE expected dose.

An evaluation was performed with 3 Dunlee DA 200 X-ray tubes on 3 GE LightSpeed 16 scanners using the data listed in the GE Technical Manual and provided to the user on installation of the scanner. The DUNLEE DA-200 X-ray tube was installed in three different GE LightSpeed -16 CT scanners delivered a dose (CTDI) which also fell well-within the GE the expected variation of ±15% from the typical dose values published in the GE Technical Manual for all three Dunlee-equipped LS-16 scanners tested.

Conclusion:
Therefore the GE Performix Pro-100 and Dunlee Reevo-240G X-ray tubes are extremely well-matched in terms of the dose delivered by each to the head and body dosimetry phantoms for the standard CTDI scan techniques as published by GE in its Technical Manual.

A copy of the complete White Paper is available at http://www.dunlee.com/resources/content/2/0/7/4/documents/White%20Paper%20VCT%20%20Lightspeed.pdf.

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