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Radiography

Á¦¸ñ MTF ÃøÁ¤¿ë ¿¢½º·¹ÀÌ ÆÒÅÒ, tungsten edge, tx5







IBA Dosimetry »çÀÇ MTF ÃøÁ¤¿ë Tungsten Edge TX5ÀÔ´Ï´Ù.
TX5 Tungsten edge´Â IEC62220-1 ±Ô°ÝÀ» ¸¸Á·ÇÏ´Â Á¤±³ÇÏ°Ô Á¦ÀÛµÈ ÆÒÅÒÀÔ´Ï´Ù.
The edge test device TX5 in accordance to IEC62220-1 for determination of the MTF consistsof a tungsten plate, edge ¡¾5 ¥ìm.



modulation transfer function (MTF)¿¡ µû¶ó ¿¢½º·¹ÀÌ ¿µ»óÀÇ Ç°ÁúÀÌ ÁÂ¿ì µË´Ï´Ù.
 
The modulation transfer function (MTF) describes the frequency response of the imaging system or how well it preserves signal.
Every imaging system cause in a lost of contrast,the MTF describe the losing contrast.



¼ÒÇÁÆ®¿þ¾î¸¦ »ç¿ëÇÏ¿© ÃÔ¿µÇÑ TX5¸¦ °¡Áö°í MTF°ªÀ» ÃøÁ¤ÇÒ ¼ö ÀÖ½À´Ï´Ù.
 
The plug-in performs MTF calculations only over slanted vertical edge images with dark side at left; If the picture is taken from an horizontal slanted edge, the image must be rotated 90¡Æbefore run the plug-in. The edge can occupy the whole image (left) or the user can ____select a ROI to be analyzed (rigth). The method used to calculate the MTF from____ a slanted edge is fully described in the bibliography (see references bottom).



The pluginrun the calculations and shows as a result four plots labeled with the SPP_, ESF_, LSF_ and MTF_ prefixes followed by the file name.ESF, LSF and MTF plots are calculated and traced as described in the MTF bibliography.SPP (Sampling Periodicity Plot) is a plot showing the result to apply the Fourier Transform Function to the series of the maximum values of the LSF used in the MTF calculations; the plot is a valuable indicator of periodicity sampling reliablenessperformed by the system because of the slanted position of the edge related with the sensor grid.



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