Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
ABSTRAK
Penelitian ini menggunakan Pesawat Angiografi Siemens Artis Zee untuk mengukur prosentase dosis kedalaman (Percentage Depth Dose, PDD) untuk mempelajari dosis di bawah kulit. Pengukuran PDD dilakukan dengan menggunakan film Gafchromic XR-RV3 yang diletakkan di antara fantom akrilik dengan 6 variasi filter pesawat, 5 variasi tegangan tabung, dan 3 variasi fokus berkas. Hasil penelitian menunjukkan karakteristik dosimetri yang didapatkan bersesuaian dengan teori, dimana titik kedalaman maksimum dan titik persentase dosis <10% semakin dalam dengan meningkatnya tegangan tabung dan filter tambahan, sementara ukuran fokus tidak memberikan pengaruh. Penelitian ini juga menunjukan bahwa dosis telah diserap sebesar lebih dari 69% oleh tubuh pada kedalaman 150 mm. Disimpulkan juga bahwa film Gafchromic XR-RV3 tidak dapat digunakan dalam pengukuran PDD angiografi dengan posisi permukaan tegak lurus berkas karena faktor buildup. Karenanya, diperlukan studi tambahan untuk menginvestigasi kedalaman buildup pada film Gafchromic XR-RV3 untuk keperluan pengukuran PDD.

---

ABSTRACT
This study used Siemens Artist Zees Angiography to measure the percentage of depth dose (PDD) to investigate dose behaviour under the skin in angiography. The PDD measurements were carried out using the Gafchromic XR-RV3 film positioned between acrylic phantoms with 6 variations of added filtrations, 5 variations in tube voltage, and 3 variations in beam focal spot sizes. The results showed that the dosimetry characteristics obtained were in accordance with the theory, where the maximum depth point and point of <10% dose went deeper with the increase of tube voltage and additional filters, and with the focal spot size having no effect. Results also shown that dose were absorbed by more than 69% by the body at 150 mm depth. It was also concluded that the Gafchromic XR-RV3 film may not be ideal in measuring PDD for angiography with the position of the film perpendicular to the beam, i.e due to horizontal buildup factor. Therefore, additional studies are required to investigate the buildup depth in Gafchromic XR-RV3 film for PDD measurement purposes.

Abstrak :
[ABSTRAK
Dosimeter film Radiochromic XR-RV3 merupakan salah satu tipe dosimeter yang dapat digunakan untuk mengukur dosis pasien pada prosedur kateterisasi jantung dengan fluoroskopi sebagai pemandu. Namun, perlu dipastikan pengaruh keberadaan film Radiochromic XR-RV3 terhadap kualitas citra. Penelitian ini menggunakan fantom Kat Ped sebagai representasi jantung dewasa dan membandingkan secara kuantitatif kualitas citra fantom yang dieksposi dengan menggunakan film dan tanpa menggunakan film GafChromic XR-RV3. Kuantitasi kualitas citra yang digunakan sebagai pembanding adalah Signal to noise ratio (SNR) dan resolusi kontras tinggi. Signal to noise ratio (SNR) yang diperoleh dianalisa menggunakan statistik t-test dengan confidence level 95%. Hasil analisa menunjukkan tidak terdapat perbedaan SNR yang signifikan dengan menggunakan film dan tanpa menggunakan film pada mode fluoroskopi low dose, normal dose dan high dose dengan diskrepansi SNR <10%. Pada mode cine 15 fps low dan 15 fps normal, terdapat kenaikan SNR dengan menggunakan film dengan diskrepansi <13% sedangkan pada mode cine 15 fps boost dan 25 fps coronary tidak terdapat perbedaan signifikan SNR dengan diskrepansi rerata < 7%. Pada high contrast analisa t-test untuk kedua mode fluoroscopy dan Cine tidak menunjukkan adanya perbedaan signifikan dengan hasil non rejected pada confidence level 95%. ABSTRACT
Radiochromic XR-RV3 film dosimeter is a type of dosimeter that can be used to measure patient dose on cardiac catheterization procedure with fluoroscopy as a guide. However, it is necessary to ensure the effect of Radiochromic XR-RV3 film to image quality. This study used a Kat Ped phantom as a representation of the adult heart and quantitatively compare the image quality by using a phantom that exposed with film and without using film GafChromic XR-RV3. Quantitation of image quality used for comparison is the signal to noise ratio (SNR) and high contrast resolution. Signal to noise ratio (SNR) obtained statistically analyzed using t-test with 95% confidence level. The analysis results showed no significant difference in SNR using film and without using film on a low dose mode, the normal dose, and high dose flouroscopy with SNR discrepancy <10%. In the cine mode of 15 fps low and 15 fps normal, there is an increased SNR by using film with discrepancy <13%, while in the cine mode of 15 fps boost and 25 fps coronary there are no significant differences with mean SNR discrepancy <7%. At high contrast t-test analysis for both Fluoroscopy and Cine mode, result showed no significant difference with the results of non-rejected at the 95 % confidence level., Radiochromic XR-RV3 film dosimeter is a type of dosimeter that can be used to measure patient dose on cardiac catheterization procedure with fluoroscopy as a guide. However, it is necessary to ensure the effect of Radiochromic XR-RV3 film to image quality. This study used a Kat Ped phantom as a representation of the adult heart and quantitatively compare the image quality by using a phantom that exposed with film and without using film GafChromic XR-RV3. Quantitation of image quality used for comparison is the signal to noise ratio (SNR) and high contrast resolution. Signal to noise ratio (SNR) obtained statistically analyzed using t-test with 95% confidence level. The analysis results showed no significant difference in SNR using film and without using film on a low dose mode, the normal dose, and high dose flouroscopy with SNR discrepancy <10%. In the cine mode of 15 fps low and 15 fps normal, there is an increased SNR by using film with discrepancy <13%, while in the cine mode of 15 fps boost and 25 fps coronary there are no significant differences with mean SNR discrepancy <7%. At high contrast t-test analysis for both Fluoroscopy and Cine mode, result showed no significant difference with the results of non-rejected at the 95 % confidence level.]