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Ditemukan 10968 dokumen yang sesuai dengan query
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N. Nagara
"We developed a gamma ray detector with an LuAG:Pr scintillator and an avalanche photodiode as a detector for a positron emission tomography (PET) system. Studies have been performed on the influences of gamma irradiation on application-specific integrated circuit (ASIC) preamp boards used as a detector module. As a device used in nuclear environments for substantial durations, the ASIC has to have a lifetime long enough to ensure that there will be a negligible failure rate during this period. These front-end systems must meet the requirements for standard positron emission tomography (PET) systems. Therefore, an equivalent noise charge (ENC) experiment is needed to measure the front-end system's characteristics. This study showed that minimum ENC conditions can be achieved if a shorter shaping time could be applied."
Center for Informatics and Nuclear Strategic Zone Utilization, 2016
607 AIJ 42:2 (2016)
Artikel Jurnal  Universitas Indonesia Library
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"Over the past decade, PET-CT has achieved great success owing to its ability to simultaneously image structure and function, and show how the two are related. More recently, PET-MRI has also been developed, and it represents an exciting novel option that promises to have applications in oncology as well as neurology. The first part of this book discusses the basics of these dual-modality techniques, including the scanners themselves, radiotracers, scan performance, quantitation, and scan interpretation. As a result, the reader will learn how to perform the techniques to maximum benefit. The second part of the book then presents in detail the PET-CT and PET-MRI findings in cancers of the different body systems. The final two chapters address the use of PET/CT in radiotherapy planning and examine areas of controversy. The authors are world-renowned experts from North America, Europe, and Australia, and the lucid text is complemented by numerous high-quality illustrations."
Berlin : Springer, 2012
e20426393
eBooks  Universitas Indonesia Library
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"The horizons of sophisticated imaging have expanded with the use of combined positron emission tomography (PET) and computed tomography (CT). PET-CT has revolutionized medical imaging by adding anatomic localization to functional imaging, thus providing physicians with information that is vital for the accurate diagnosis and treatment of pathologies. Since the integration of PET and CT several years ago, PET/CT procedures are now routine at leading medical centers throughout the world. This has increased the importance of nuclear medicine physicians acquiring a broad knowledge in sectional anatomy for image interpretation. The Atlas of Sectional Radiological Anatomy for PET/CT is a user-friendly guide presenting high-resolution, full-color images of anatomical detail and focuses solely on normal FDG distribution throughout the head & neck, thorax, abdomen, and pelvis, the primary sites for cancer detection and treatment through PET/CT.
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New York: Springer, 2012
e20425864
eBooks  Universitas Indonesia Library
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Dake, Liu
Burlington: Elsevier , 2008
621.391 6 DAK e
Buku Teks  Universitas Indonesia Library
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Farooq, Umer
"This book presents a new FPGA architecture known as tree-based FPGA architecture, due to its hierarchical nature. This type of architecture has been relatively unexplored despite their better performance and predictable routing behavior, as compared to mesh-based FPGA architectures. In this book, we explore and optimize the tree-based architecture and we evaluate it by comparing it to equivalent mesh-based FPGA architectures."
New York: [, Springer], 2012
e20418276
eBooks  Universitas Indonesia Library
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Sonde, B.S.
New Delhi: Wiley Eastern Limited, 1980
621.381 SON i (1)
Buku Teks  Universitas Indonesia Library
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Nji Raden Poespawati
"ABSTRAK
Transformasi Fourier merupakan salah satu contoh dari teknik analisa transformasi, yang digunakan untuk menyederhanakan solusi dari suatu masalah komputasi. Transformasi Fourier dari sebuah gelombang diperlukan untuk memisahkan gelombang tersebut menjadi sejumlah gelombang sinusoidal dengan frekuensi yang berbeda.
Sebuah algortima yang efisien, aitu suatu Transformasi Fouerier cepat (Fast Fourier Transform - FFT) telah dikembangkan. FFT ini digunakan untuk menghitung DFT (Discrete Fourier Transform). Dengan demikian telah terjadi perubahan yang besar dalam menganalisa berbagai cabang ilmu pengetahuan (science). Prosesor FFT yang terkecil mempunyai dua titik transformasi (N=2).
Pada penelitian ini dibahas tentang implementasi tata letak VLSI pada perancangan prosesor FFT untuk titik transformasi sebanyak dua buah (N=2). Implementasi ini dilakukan pada kertas milimeter dan hasilnya dianalisa secara teoritis"
Fakultas Teknik Universitas Indonesia, 1998
LP-pdf
UI - Laporan Penelitian  Universitas Indonesia Library
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"Systems on Chip (SoC) for communications, multimedia and computer applications have recently received much international attention; one such example being the single-chip transceiver. Modern microelectronic design adopts a mixed-signal approach as a complex SoC is a mixed-signal system including both analogue and digital circuits. Automatic testing becomes crucially important to drive down the overall cost of next generation SoC devices.
Test and fault diagnosis of analogue, mixed-signal and RF circuits, however, proves much more difficult than that of digital circuits due to tolerances, parasitics and nonlinearities and therefore, together with challenging tuning and calibration, remains the bottleneck for automatic SoC testing.
This book provides a comprehensive discussion of automatic testing, diagnosis and tuning of analogue, mixed-signal and RF integrated circuits, and systems in a single source. The book contains eleven chapters written by leading researchers worldwide. As well as fundamental concepts and techniques, the book reports systematically the state of the arts and future research directions of these areas. A complete range of circuit components are covered and test issues are also addressed from the SoC perspective.
An essential reference companion to researchers and engineers in mixed-signal testing, the book can also be used as a text for postgraduate and senior undergraduate students.
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London: Institution of Engineering and Technology, 2008
e20452172
eBooks  Universitas Indonesia Library
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Muroga, Saburo
New York : John Wiley & Sons, 1982
621.381 73 MUR v
Buku Teks  Universitas Indonesia Library
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Intan Apriliani Syaridatul Mu`minah
"Pengecekan akurasi kualitas citra dalam program kontrol kualitas quality control, QC dapat ditingkatkan dengan penggunaan fantom yang mendekati kondisi realistis pada pemindaian klinis. Penelitian ini ditujukan untuk mengembangkan fantom desain khusus yang terdiri dari material organik ekuivalen-hati dan otot jaringan lunak . Karakterisasi sifat radiologi material ekuivalen jaringan menunjukan bahwa material ekuivalen jaringan lunak otot yang tersusun atas campuran Gondorukem, Malam Cecek, dan tepung beras dengan rasio massa 70/20/10 memiliki CT Number -20.27 0.33 HU, densitas massa 1.055 g/cm3 dan densitas elektron 3.461 1023 e/m3. Material ekuivalen jaringan hati yang tersusun atas campuran Malam Cecek dan tepung beras dengan rasio massa 60/40 memiliki CT Number 74.17 1.48 HU, densitas massa 1.024 g/cm3 dan densitas elektron 3.396 1023 e/m3.
Penggunaan fantom desain khusus dalam mengevaluasi kualitas citra PET berdasarkan parameter full-width-half-maximum FWHM resolusi dan signal-to-noise ratio SNR menunjukan bahwa detektabilitas sistem pemindaian PET bergantung terhadap ukuran pixel dan metode rekonstruksi citra yang digunakan. Sistem pencitraan PET/CT Siemens Biograph dengan rekonstruksi True-X dan filter Butterworth menggunakan ukuran pixel 1 x 1 mm2, memberikan ukuran obyek pada citra PET lebih kecil daripada ukuran obyek sebenarnya, kecuali pada obyek 4.02 mm. Sistem pemindaian PET/CT Philips Gemini TOF 16 dengan ukuran pixel 4 x 4 mm2 menunjukan adanya perbesaran ukuran obyek kecil dengan diameter kurang dari 16 mm.
Kedua pesawat PET/CT menunjukan bahwa ukuran obyek pada citra cenderung lebih kecil atau mencapai threshold 80 dari ukuran sebenarnya pada obyek berdiameter lebih besar sama dengan 16.30 mm. Sebaliknya, overestimation nilai FWHM terjadi pada obyek berukuran kecil 4.20 mm sebagai akibat dari terjadinya partial volume effect. Studi pengukuran kualitas citra dengan fantom desain khusus ini menunjukan bahwa pemilihan metode rekonstruksi, filter post processing, dan ukuran pixel mempengaruhi resolusi atau detektabilitas dan SNR pada citra PET. Pada akhirnya, fantom desain khusus ini mampu memberikan analisa kualitas.

The purpose of this research was to develop a phantom for quality control QC of PET CT image quality. The phantom was constructed by tissue equivalent materials which consist six cylindrical hot lesions with diameter of 4.20, 6.20, 8.30, 9,80, 16.30, and 19.00 mm. Wax and rice starch were combined to produce the tissue equivalent materials. The results showed that combination 70 20 10 of gondorukem cecek wax rice starch and 60 40 of cecek wax rice starch yielded liver and muscle surrogate materials respectively. Liver equivalent material LEM was 74.17 1.48 HU, 1.024 g cm3 of mass density, and 3.396 1023 e m3 of electron density. While, muscle equivalent material MEM was 20.27 0.33 HU, 1.055 g cm3 of mass density and 3.461 1023 e m3 of electron density.
Then, the phantom was scanned using two different PET CT scanner to determine the detectability and signal to noise ratio SNR as measure PET CT imaging performance. It showed that the detectability of PET CT scanner was affected by pixel size and reconstruction method for image acquisitions. For Siemens Biograph PET CT scanned using pixel sixe of 1 1 mm2, FWHMs were smaller than the actual size of the hot lesions. Meanwhile, for Philips Gemini PET CT scanned using pixel sixe of 4 4 mm2, FWHMs were larger than the actual size of the hot lesions.
For both PET CT scanner, ratio of FWHM actual size reached the threshold of 80 at object diameter ge 16.30 mm. In contrast, overestimation of FWHM occurred at smaller object diameter 4.20 mm significantly caused by the partial volume effect. The study also indicated that image reconstructions, post processing smoothing filter, and pixel size may give impact to the detectability and SNR performed by a PET CT system. It was concluded that the phantom could be used to analyze the image quality performance in PET CT imaging.
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Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2018
T50690
UI - Tesis Membership  Universitas Indonesia Library
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