Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mempelajari pengaruh focalspot berupa SID (Source
Image Distance) terhadap ketajaman citra radiografi dengan stepwedge sebagai objek
penelitian. Stepwedge yang dipakai memiliki tiga level ketebalan, yaitu 0,6 cm, 1,2
cm dan 1,8 cm. Proses pengambilan citra menggunakan pesawat sinar-X merk
Shenzhen Angell, tipe Angell-326-v, nomor seri Angell-326-v2020099022 dan merk
tabung yaitu Siemens. Jarak SID (Source Image Distance) yang digunakan 80 cm, 90
cm dan 100 cm. Faktor eksposi yang digunakan yaitu, 60 kV/100 mA dan 90 kV/200
mA. Hasil penelitian menunjukan bahwa jarak SID (Source Image Distance) terhadap
ketidaktajaman citra radiografi. Semakin jauh jarak SID (Source Image Distance) dari
sumber cahaya (sinar-X) ke objek menyebabkan hasil citra semakin tajam. Namun,
besar arus dan tegangan yang diberikan juga mempengaruhi ketajaman citra radiografi.
Hasil foto rongent yang kurang tajam kemudian diolah menggunakan yaitu image J
dengan perlakuan kecerahan (bright), kelembutan (smooth) dan ketajaman (sharp).
Hasil penelitian menunjukan bahwa tinggi tegangan tabung dan arus yang diberikan
dapat mengurangi nilai kontras, kuantitas dan kecerahan citra radiografi.

Kata kunci: Citra radiografi, SID (Source Image Distance), image-J.

This research aims to study the effect of focal spot in the form of SID (Source Image Distance) on the sharpness of radiographic images using a step wedge as the research object. The stepwedge used has three thickness levels, namely 0.6 cm, 1.2 cm, and 1.8 cm. The image acquisition process using the X-ray machine brand Shenzhen Angell, model Angell-326-v, serial number Angell-326-v2020099022, and the tube brand Siemens. The Source Image Distance (SID) used is 80 cm, 90 cm, and 100 cm. The exposure factors used were 60 kV/100 mA and 90 kV/200 mA. The research results indicate that the Source Image Distance (SID) affects the sharpness of the radiographic image. The farther the SID (Source Image Distance) from the light source (X-ray) to the object, the sharper the resulting image becomes. However, the magnitude of the current and voltage applied also affects the sharpness of the radiographic image. The results of the X-ray photos that are not sharp are then processed using Image J with adjustments for brightness, smoothness, and sharpness. (sharp). The research results indicate that the height of the tube voltage and the current applied can reduce the contrast, quantity, and brightness of the radiographic image. Keywords: Radiographic image, SID (Source Image Distance), image-J.