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4 4.1 Lab 4: Radiography and Tomography Part 2 Pre-Lab 4 Read the following pages entitled \"Transmission Radiography and Tomography: A Simplied Overview'I as a prerequisite to Lab 2. You may not understand everything from this handout, but I would like you to look for the linear algebra in the methods and try to get a general overview of the Radiography Process. You do not need to fully understand anything else besides the linear algebra concepts that come up. I have included the following question for you to answer to help guide you in your reading (below) along with the goals and summary of terminology of what you should get out of the reading after the reading section. 4.1.1 Goals from the Reading Assignment: To understand a unied and simplied physical model of taking an xray radiograph of an object. To recognize and appreciate that, sometiJnes, complex phenomena can be reasonably modeled with straightforward mathematics. 'Ib recognize and appreciate that mathematical assumptions should be backed by physical reality in order to preserve model integrity. This is justication! To be exposed to the notation used in the Lab 2. To understand the matrix equation representation of the radiographic process. 4.1.2 Questions from the Reading Assignment: 1. 2. Given Tkj : 0.42, what does this value mean? What is accomplished in the matrix multiply when multiplying an object vector by the kth row of T172 3. Explain how you change the radiographic operator when changing from one view to many. 4. 1Why do we use pixel values 3;: where ,5}; is defined as 3;: E aln(:.f) instead of the expected photon count pk