# K983793: Preference Treatment System

- Pathway: 510(k) (Traditional)
- Applicant: Northwest Medical Physics Equipment, Inc.
- Decided: Oct 5, 1999 after 343 days
- Product code: LNH (System, Nuclear Magnetic Resonance Imaging)
- Device class: 2
- Regulation: 21 CFR 892.1000
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 1 generation back to K970464 (1997). 1 ancestor in all.
13 later devices descend from it; 1 cites it directly.
0 of 15 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K970464: P Reference TPS (Treatment Planning Software) 1.1, Northwest Medical Physics Equipment, Inc. (1997) Summary page 2.

## Most influential descendants
- K012575: Prefernce Imrt Treatment Planning Module (2002), 12 descendants of its own
- K060906: Calypso 4D Localization System (2006), 11 descendants of its own
- K080726: Calypso 4D Localization System (2008), 9 descendants of its own
- K102373: Calypso System with Dynamic Edge Gating (2010), 6 descendants of its own
- K112768: Calypso Systems with Dynamic Edge Gating (2011), 4 descendants of its own

## Indications for use
The indications for use are applicable as previously presented for pReference TPS (K970464), such intracranial diseases as gliomas, neuromas, meningiomas, astroctyomas, arteriovenous malformations, and metastatic carcinomas. The indications for use of pReference Treatment System are expanded to include lesions requiring extracranial stereotactic radiotherapy or radiosurgery. These include hepatic, pancreatic, retroperitoneal, paraspinal, skeletal, and prostatic tumors. The software is used to electronically import CT images containing the target to be irradiated, to determine the precise location of the the target with respect to implanted fiducials, to define and visualize treatment beam locatlons, and to visualize dose to the target and other structures.

Source page: https://510kreport.com/device/K983793
Methodology: https://510kreport.com/methodology