# LQ Model

> LQ Model (iPhone/iPad app by Julian Debus.)

- Source: https://appshunter.io/ios/app/lq-model/id437938480 (this page in markdown: same URL + `.md`)
- Developer: [Julian Debus](https://appshunter.io/developer/437938483)
- Category: Medical, Reference
- Price: $3.99
- Age rating: 12+
- Requires: iOS 10.2 · 14 MB
- Languages: English, German
- Released: 2011-05-26
- Data updated: 2025-06-25
- User reviews in markdown: https://appshunter.io/ios/app/lq-model/id437938480/reviews.md

## What is LQ Model?

The LQ Model app allows professionals in the field of radiotherapy, oncology, medical physics and radiation biology to calculate the biological effects of differently fractioned radiation doses. Using live calculation, the app allows to estimate the influence of every parameter very easily. It will save you the time and energy needed to calculate the formula for the Linear Quadratic Model by hand! 

Main features:
* Calculation of Total dose, Biodose and Bio-isodose
* Easy data-input via sliders
* Database of organs, complete with a/b values
* Links and Literature for reference to the Linear Quadratic Model

The LQ App is not intended as a clinical tool and may only be used for scientific purposes.


## Version history (last 5 releases)

### 1.5 — 2017-08-28

This app has been updated by Apple to display the Apple Watch app icon.

Rejoice, LQ Model lives on!

* Improved UI for larger screen sizes
* Added option to display units in cGy
* Updated with 64-bit support

### 1.4 — 2014-03-08

iOS 7 UI

### 1.3.1 — 2012-10-23

iPhone 5 support

### 1.3 — 2012-06-05

* The app has been rewritten from the ground up to take advantage of iOS 5 specific features; this update requires iOS 5.x

* Added support for linear-quadratic-linear radiation doses (Astrahan mode, can be enabled in the settings)

### 1.2 — 2011-08-05

NEW:
* Mode for SBRT (Stereotactic Body Radiotherapy) calculations
* Integrated Settings into the App (accessible via the button in the lower left corner)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2025-06-25.*