Summary of Contents for RTI Slit Camera
- Page 1 Slit Camera User’s Manual – English – Version 1.0B 4707.001199#1.0B RTI Slit Cameara User’s Manual 2015-02-11...
-
Page 2: Table Of Contents
About this Manual .................. 3 1.2. Introduction to the Slit Camera ............... 3 Description of the RTI Slit Camera ............4 2.1. Setting Up the Slit Camera for the First Time .......... 5 2.2. Hardware and Specifications ..............5 2.2.1. Slit Camera ................... 5 2.2.2. -
Page 3: Introduction
Introduction to the Slit Camera 1.2. Congratulations to your purchase of the Slit Camera from RTI. You have now in your hand a quality tool for focal spot size evaluation. It has been carefully designed to meet the needs of modern X-ray systems. -
Page 4: Description Of The Rti Slit Camera
Figure 2-1 Slit Camera with (left) and without (right) the optional tilting device. The Slit Camera can be rotated 90 degrees in the Slit Camera holder. See figure 2-2 below. The 90 degree rotation simplifies the measurement of length and width measurements of the focal spot since the slit only have to be aligned once. -
Page 5: Setting Up The Slit Camera For The First Time
Setting Up the Slit Camera for the First Time 2.1. Before you use your Slit Camera for the first time, mount the Slit Camera and the stand to make sure that all mechanical parts fits together, and that no parts have been damaged during transportation. -
Page 6: Standards And Compliances
Equipment (WEEE) places an obligation on manufacturers, distributors, and retailers to take back electronics products at the end of their useful life. The WEEE directive covers all RTI products being sold into the European Union (EU) as of August 13, 2005. Manufacturers, distributors, and retailers are obliged to finance the cost of recovery from municipal collection points, reuse, and recycling of specified percentages per the WEEE requirements. -
Page 7: Theory Of Focal Spot Reproduction
1], standard through a 10 µm wide slit, and then registered with an image receptor (not included in the RTI Slit Camera). This is described in figure 1 below. The reproduction is a one-dimensional “picture” of the focal spot in one direction and a perpendicular measurement has to be done to get the characteristics of the focal spot in both length and width directions. -
Page 8: Why Measure The Focal Spot
Length Width Figure 3–2 Image of the focal spot of a radiographic X-ray tube. RTI Slit Camera User’s Manual 1.0B... - Page 9 The other depends on how you perform the imaging. The Figure 3–4 and Figure 3–5 gives a description of what the size and shape of the focal spot mean for the reproduction of objects. 1.0B RTI Slit Camera User’s Manual...
- Page 10 Figure 3–5 Reproduction of an object with different foci. If the tube filament is worn-out and about to break you can often see this on the focal spot and therefore be prepared to replace the tube when it breaks. RTI Slit Camera User’s Manual 1.0B...
-
Page 11: X-Ray Tube Focal Spot Measurements
Make an exposure and verify that the image of the slit holder is centered over the position you intended to evaluate the focal spot at. Table 4-1 Minimum Magnification for Slit Measurement Technique 1.0B RTI Slit Camera User’s Manual... -
Page 12: Slit Measurement Using Film And Magnifier Lens
The true physical distance is 34 mm. For example, assume the image edge separation was measured as 68 mm. The magnification (E) is then (Eq. 4.2) RTI Slit Camera User’s Manual 1.0B... -
Page 13: Slit Measurement Using Digital Image
Note: In the example below the image of the RTI Slit Camera shows a former version of the Slit Camera and holder. Even if the images are not recognized, the principles for the evaluation are the same. - Page 14 One can also read the x-values by moving the pointer over the image. In this case the x-value for the left edge was 117.61, and the right edge was 199.78. That gives the width. RTI Slit Camera User’s Manual 1.0B...
- Page 15 The IEC 60336 standard specifies the Nominal focal spot value in a look-up table, see Appendix A. Using the results above (width = 1.86, length = 2.34) and the look-up table, gives a nominal focal spot value of 1.6. 1.0B RTI Slit Camera User’s Manual...
-
Page 16: Word List
REFERENCE PLANE. “Line Spread Function. In an imaging system, distribution of the intensity from a line source along a straight line in a specified image plane where the straight line is normal to RTI Slit Camera User’s Manual 1.0B... - Page 17 RADIATION SOURCE and of the BEAM LIMITING SYSTEM. (From the IEC 788 standard) Reference axis ”For a RADIATION SOURCE, line in the REFERENCE DIRECTION through the centre of the RADIATION SOURCE.” 1.0B RTI Slit Camera User’s Manual...
- Page 18 LENGTH. (Free from the IEC 60336 standard) The width is normally perpendicular to the perpendicular projection of the anode cathode axis on the REFERENCE PLANE. RTI Slit Camera User’s Manual 1.0B...
-
Page 19: Nominal Focal Spot Size - Iec 60336
IEC 60336, to examine the slit images by eye trough a magnifying lens. The magnifying lens shall have a built-in graticule with divisions of 0.1 mm and a magnification of 10. 1.0B RTI Slit Camera User’s Manual... - Page 20 Table A-2 Required magnification for focal spot slit radiograms in accordance with IEC 60336. Nominal focal spot Enlargement factor value, f E = n / m f 0.4 E 3 0,5 f 1.0 E 2 1.1 f E 1 RTI Slit Camera User’s Manual 1.0B...
-
Page 21: Index
Why measure the focal spot?, 8 Focal spot theory, 7 Width. See Focal spot width FWFM, 16 X-ray Geometrical blurring, 9 cathode. See Filament IEC 336, 7, D-1 focal spot. See Focal spot Length. See Focal spot length 1.0B RTI Slit Camera User’s Manual...
Need help?
Do you have a question about the Slit Camera and is the answer not in the manual?
Questions and answers