Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2020 Nov 23;7(2):51–61. doi: 10.14338/IJPT-XX-000XX.1

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

©Copyright 2020 The Author(s)

Distributed under Creative Commons CC-BY (https://creativecommons.org/licenses/cc-by/4.0/)

PMC Copyright notice

Figure 4. — Absolute percentage of difference between measured topping power ratio (SPR) and 5 different models for calculating SPR from double-energy computed tomography (DECT) images for 26 different tissue-equivalent plugs from the commercial Gammex and CIRS computed tomography (CT) calibration phantoms. Abbreviations: CB2, calcium carbonate bone; HDPE, high-density polyethylene; MPTC, Maryland Proton Treatment Center.