medphys365.blogspot.com
365 Days of Medical Physics: 365 Days of Medical Physics blogging
http://medphys365.blogspot.com/2012/04/365-days-of-medical-physics-blogging.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. 365 Days of Medical Physics blogging. Welcome to my new blog! I'm intending to make short posts ( nearly. Every day for the next year covering a broad range of medical physics topics. The idea behind this blog is largely to help motivate me to consistently push my medical physics knowledge, but also to foster discussion online relevant to others learning medical physics. The blog I co-author will Herr Dr. Niels Bassler. June 10, 201...
medphys365.blogspot.com
365 Days of Medical Physics: April 2012
http://medphys365.blogspot.com/2012_04_01_archive.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. Multileaf collimators: modern beam shaping. One of the most important aspects of therapeutic radiation delivery is beam shaping. The most common technology currently used to shape x-ray beams is the multileaf collimator or MLC. 120 leaf multileaf collimator. Key advantages of MLC's include:. Dynamic movement of leaves during delivery allows for intensity modulated fluence patterns not achievable with conventional blocks. Intensity m...
medphys365.blogspot.com
365 Days of Medical Physics: D and V notation in radiation therapy planning
http://medphys365.blogspot.com/2013/01/d-and-v-notation-in-radiation-therapy.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. D and V notation in radiation therapy planning. One of the commonly used notation conventions in radiation therapy planning is the D and V notation (e.g. D90 and V120). In this short post I will explain them. The D and V notation are conventions that are designed to designate volumes and doses that correspond to features and goals in a treatment plan (doses and volumes). D90 of the prostate = 65 Gy. V120 of the prostate. The V and D...
medphys365.blogspot.com
365 Days of Medical Physics: Multileaf collimators: modern beam shaping
http://medphys365.blogspot.com/2012/04/multileaf-collimators.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. Multileaf collimators: modern beam shaping. One of the most important aspects of therapeutic radiation delivery is beam shaping. The most common technology currently used to shape x-ray beams is the multileaf collimator or MLC. 120 leaf multileaf collimator. Key advantages of MLC's include:. Dynamic movement of leaves during delivery allows for intensity modulated fluence patterns not achievable with conventional blocks. INTERNATION...
medphys365.blogspot.com
365 Days of Medical Physics: The basics of IMRT: an overview
http://medphys365.blogspot.com/2012/04/basics-of-imrt-overview.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. The basics of IMRT: an overview. Intensity modulated radiation therapy. IMRT) is one of the workhorse delivery methods in current radiation therapy. In many ways, it is a significant step up over the previous standard technique of 3D conformal radiation therapy (3DCRT). I'm going to start talking about IMRT with a very basic overview of how it works. Key steps in IMRT planning and delivery:. Beam angle and energy selection. KY Cheun...
medphys365.blogspot.com
365 Days of Medical Physics: Dose-volume histogram basics
http://medphys365.blogspot.com/2012/05/dose-volume-histogram-basics.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. A dose-volume histogram (DVH) is a mathematical tool to assess the appropriateness of a given radiation therapy plan. It can be used to assess whether a plan meets desired constraints for a voulme of interest, within certain limitations. DVH’s are widely used and understanding how they work is a basic skill for treatment plan assessment. In this post I’ll discuss some DVH basics. A typical cumulative dose-volume histogram (cDVH).
carlwillis.wordpress.com
Gamma activity measurements of Tokyo-area soil samples | Special Nuclear Material
https://carlwillis.wordpress.com/2011/11/04/gamma-activity-measurements-of-tokyo-area-soil-samples
A Carl Willis Joint. Laquo; Trick or Treat! US Radium, Then and Now. Gamma activity measurements of Tokyo-area soil samples. November 4, 2011. Three nuclear reactors melted down. But even densely-populated Tokyo, some 150 miles distant, received significant fallout. Last month, I received a set of six soil samples from the Tokyo region, and, using my HPGe gamma detector. I have attempted a quantitative analysis of the two predominant gamma activities in these samples, Cs-137 and Cs-134. Sample 2: Garden ...
carlwillis.wordpress.com
Lake Chagan, seen from the crater rim | Special Nuclear Material
https://carlwillis.wordpress.com/2012/08/19/gamma-analysis-of-chagan-atomsite/p1050770m_small
A Carl Willis Joint. Gamma Analysis of Chagan “Atomsite”. Raquo; Lake Chagan, seen from the crater rim. Lake Chagan, seen from the crater rim. Lake Chagan, seen from the crater rim. Leave a Reply Cancel reply. Enter your comment here. Fill in your details below or click an icon to log in:. Address never made public). You are commenting using your WordPress.com account. ( Log Out. You are commenting using your Twitter account. ( Log Out. You are commenting using your Facebook account. ( Log Out.
medphys365.blogspot.com
365 Days of Medical Physics: Comparing dose distributions: DTA and dose-difference
http://medphys365.blogspot.com/2012/05/comparing-dose-distributions-dta-and.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. Comparing dose distributions: DTA and dose-difference. Radiation therapy plan quality assurance often hinges on comparing calculated dose distributions with measured dose distributions. One of the most common techniques to compare dose distributions is the combined use of distance-to-agreement (DTA) and dose difference. In this post I will give an overview of these concepts. A planar dose distribution from IMRT. Such that D( a.
medphys365.blogspot.com
365 Days of Medical Physics: IMAT/VMAT basics
http://medphys365.blogspot.com/2012/05/imatvmat-basics.html
365 Days of Medical Physics. Nuggets of knowledge about medical physics. One of the newest and most interesting external beam delivery techniques today goes by many names: intensity modulated arc therapy (IMAT), volumetric modulated arc therapy (VMAT), etc. To make things more confusing, vendors have each given this technique their own proprietary names: RapidArc (Varian), SmartArc (Philips), and VMAT. Didn't I already say VMAT? At its most basic IMAT is essentially conventional IMRT. In the figure showi...