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Ditemukan 1722 dokumen yang sesuai dengan query
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Andrari Grahitandaru
"A two dimensional layer or cross section of a three dimensional object can be reconstructed by means of a large number of one dimensional projections through this layer. Reconstruction a two dimensional phantom from its one-dimensional projection has been accomplished in this thesis using the technique where the input projection data of CT X-Ray is simulated. The qualities of reconstructed phantom from the projections have shown a good result compared to the original image. This reconstruction technique has been implemented on PC and the reconstructed image is displayed using VGA monitor."
Depok: Fakultas Teknik Universitas Indonesia, 1992
T-Pdf
UI - Tesis Membership  Universitas Indonesia Library
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Fakultas Teknik Universitas Indonesia, 1995
S38431
UI - Skripsi Membership  Universitas Indonesia Library
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Aryono Prihandito
Yogyakarta: Kanisius, 1988
526.8 ARY p
Buku Teks  Universitas Indonesia Library
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Rifqi Ramadhan
"ABSTRACT
Korban kanker dan tumor akut semakin bertambah tiap tahunnya dan menjadi salah satu penyebab kematian manusia terbanyak di dunia. Kanker dan tumor merupakan sel jaringan tubuh yang tumbuh secara abnormal dan merusak jaringan disekitarnya. Pada awalnya kanker dan tumor tidak memiliki gejala yang pasti pada stadium awal, dan bahkan dapat menyerang jaringan tubuh bagian dalam yang menyebabkan tidak bisa dilihat dengan mata manusia. Penyebab umum dari penderita kanker dan tumor akut adalah telatnya pendeteksian dini. Pendeteksian dini yang murah, proses yang cepat, sistem yang sederhana, dan alat yang portable menjadi salah satu solusi yang tepat untuk mengantisipasi perkembangan kanker ataupun tumor yang lebih jauh. Dari semua metode yang memiliki sistem perangkat keras yang murah, sederhana, dan portable yaitu metode microwave imaging. Algoritma yang paling sederhana dalam microwave imaging adalah Filtered Back Projection (FBP) dan Algebraic Reconstruction Technique (ART). Kedua metode tersebut akan dibandingkan dengan cara merekonstruksi citra phantom fisik buatan yang memiliki dua karakteristik dielektrik yang berbeda. Metode perbandingan kinerja yang dipakai terbagi menjadi dua, yaitu analisis kualitatif dan kuantitatif. Analisis perbandingan secara kualitatif meliputi kasar atau halusnya citra dan keberhasilan membedakan dielektrik secara kasat mata. Sedangkan metode kuantitatif meliputi metode Histogram, Structural Similarity, Mean Squared Error, dan Peak Signal-to-Noise Ratio. Setelah dibandingkan keduanya berhasil membedakan kedua dielektrik tetapi FBP memiliki nilai parameter analisis kuantitatif yang lebih baik dibandingkan ART. Di sisi lain ART menghasilkan citra yang lebih kontras dengan persebaran grayscale level yang lebih lebar dibandingkan FBP dan memperjelas citra yang dihasilkan.

ABSTRACT
Victims of acute cancer and tumor are growing each year and just become one of the causes of human deaths in the world. Cancer and the tumor tissue cells are actually normal cells that grew abnormally and turn to take over and damage the surrounding tissue. At the beginning, cancer and tumors do not have definite symptoms in its early stages, and can even attack the tissues inside of the body that can not be seen with the human eye. Early detection system which is cheap, quick, simple, and portable is appropriate to anticipate the further development of cancer or tumor. Among all the methods that have a cheap, simple, and portable hardware system is microwave imaging methods. The two simplest algorithm in the microwave imaging are Filtered Back Projection (FBP) and Algebraic Reconstruction Technique (ART). Both of these methods will be compared by reconstructing the image of an artificial physical phantom that has two different dielectric value. Performance comparison method that has been used is divided into two method, namely qualitative and quantitative method. Qualitative comparative analysis covers the smoothness of an image and also the success in distinguishing dielectric value differences by looking the image with normal human eye. While quantitative method includes Histogram, Structural Similarity Index (SSIM), Mean Squared Error (MSE), and Peak Signal-to-Noise Ratio (PSNR). Having compared, their image results managed to distinguish the two dielectric, but in quantitative method FBP results are better than ART. On the qualitative method, ART produces more contrast image with wider distribution grayscale level than FBP, which is make the ART result image more distinguishable for each dielectric value."
2016
S63227
UI - Skripsi Membership  Universitas Indonesia Library
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Dimas Aria Shufyananda
"Saat ini, komputasi tomografi (computed tomography/CT) sinar-X sudah banyak diterapkan di industri manufaktur untuk menguji atau memeriksa struktur internal suatu sampel. Metode Filtered Back Projecrtion (FBP) merupakan metode rekonstruksi citra CT yang popular digunakan untuk menghasilkan citra yang mempunyai noise lebih sedikit, kontras yang tajam dan mampu membedakan densitas antara latar belakang dan objek. Pemindaian citra digunakan mode geometri cone beam dengan rentang sudut 360° dan inkremen sudut 1°. Proses dimulai dari denoising, normalisasi, sintesis sinogram, dan rekonstruksi citra menggunakan FBP. Hasil dari penelitian ini adalah citra 2 dimensi hasil dari pemindaian citra geometri cone beam, sinogram dan hasil rekonstruksi citra irisan dengan parameter evaluasi yaitu Signal to Noise Ratio (SNR), Contrast to Noise Ratio (CNR), dan kontras relatif. Untuk mencari parameter evaluasi tersebut digunakan input koordinat Region of Interest (RoI). Diperoleh filter Cosine paling baik dalam memberikan nilai SNR, CNR dan kontras relatif paling tinggi. Dalam post processing akan digunakan variasi filter low pass (Ideal, Butterworth dan Gaussian). Input citra hasil rekonstruksi FBP menggunakan filter Cosine. Terdapat parameter evaluasi tambahan yaitu SSIM (Structural Similarity Index Measure). Beberapa parameter input seperti frekuensi cut-off, dan orde akan mempengaruhi frekuensi spasial. Frekuensi ini mengacu pada seberapa sering suatu gray value muncul atau berulang dalam citra.

Currently, X-ray computational tomography (CT) has been widely applied in the manufacturing industry to test or examine the internal structure of a sample. The Filtered Back Projection (FBP) method is a popular CT image reconstruction method used to produce images that have less noise, sharp contrast and are able to distinguish densities between the background and the object. Image scanning uses the cone beam geometry mode with an angle range of 360° and an angle increment of 1°. The process starts from denoising, normalizing, sinogram synthesis, and image reconstruction using FBP. The results of this study are 2-dimensional images resulting from scanning geometric cone beam images, sinograms and reconstructed sliced images with evaluation parameters namely Signal to Noise Ratio (SNR), Contrast to Noise Ratio (CNR), and relative contrast. To find the evaluation parameters, the Region of Interest (RoI) coordinate input is used. The Cosine filter is the best in providing the highest SNR, CNR and relative contrvalues. In post processing, variations of low pass filters (Ideal, Butterworth and Gaussian) will be used. Input the FBP reconstruction image using the Cosine filter. There is an additional evaluation parameter, namely SSIM (Structural Similarity Index Measure). Several input parameters such as cut-off frequency, and order will affect the spatial frequency. This frequency refers to how often a gray value appears or repeats in the image."
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2023
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UI - Skripsi Membership  Universitas Indonesia Library
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Yosua Bisma Putrapratama
"PT XYZ merupakan perusahaan rintisan yang menjual produk-produk alami melalui situs web dan aplikasi mobile mereka. Proyek perangkat lunak di PT XYZ diimplementasikan menggunakan metode agile dan kerangka kerja Scrum agar tanggap dengan kebutuhan pasar dan pelanggan. Nyatanya, proses pengembangan perangkat lunak masih mengalami keterlambatan dalam perilisan karena rendahnya tingkat ketercapaian target untuk sprint. Dampak yang ditimbulkan adalah tidak tercapainya Objective and Key Result (OKR). Berdasarkan wawancara dengan narasumber dari PT XYZ, yaitu anggota tim Scrum yang terdiri dari Product Manager, Technical Lead, Senior Software Engineer, dan QA Analyst menunjukkan bahwa akar permasalahaan yang dihadapi perusahaan erat kaitannya dengan proses implementasi Scrum, terutama acara dan artefak Scrum. Permasalahan tersebut menjadi pemicu penelitian ini untuk melakukan evaluasi terhadap implementasi Scrum di perusahaan. Evaluasi implementasi Scrum dilakukan dengan menggunakan kerangka kerja Scrum Maturity Model (SMM) dan metode penilaian Standard Capability Maturity Model Integration Appraisal Method for Process Improvement (SCAMPI) kelas C. Hasil penilaian menunjukkan bahwa implementasi Scrum di PT XYZ masih berada pada tingkat kematangan 1 karena terdapat sebuah goal di tingkat kematangan 2 belum fully achieved, yaitu goal basic Scrum management dengan nilai 71,43% largely achieved. Setelah melakukan penilaian, penelitian ini menghasilkan 3 rekomendasi untuk artefak Scrum, 4 rekomendasi untuk acara Scrum, 2 rekomendasi untuk komponen pendukung Scrum, dan 5 rekomendasi untuk akar permasalahan penelitian. Penelitian ini juga menyertakan langkah-langkah perubahan yang dapat dilaksanakan perusahaan untuk memperbaiki alur proses Scrum terkait acara dan artefak Scrum. Rekomendasi dan langkah-langkah perubahan diharapkan mampu untuk meningkatkan ketercapaian target sprint sehingga memungkinkan perilisan proyek perangkat lunak yang tepat waktu dan mencapai nilai bisnis yang diharapkan perusahaan
PT XYZ is a start-up company that sells natural products through its website and mobile application. The software project at PT XYZ is implemented using agile methods and the Scrum framework to respond to the market and customer needs. In fact, the software development process is still experiencing delays in release due to the low rate of achieving targets for sprints. The impact is not achieving the Objective and Key Result (OKR). Based on interviews with representatives from PT XYZ, namely members of the Scrum team consisting of Product Manager, Technical Lead, Senior Software Engineer, and QA Analyst, it shows that the root problems faced by the company are closely related to the Scrum implementation process, especially Scrum events and artifacts. These problems are the trigger for this research to evaluate the implementation of Scrum in the company. Evaluation of Scrum implementation is carried out using the Scrum Maturity Model (SMM) framework and the Standard Capability Maturity Model Integration Appraisal Method for Process Improvement (SCAMPI) Class C assessment method. The results of the assessment show that the implementation of Scrum at PT XYZ is still at maturity level 1 because there is a goal at maturity level 2 that has not been fully achieved, namely the basic Scrum management goal with a value of 71.43% (largely achieved). After conducting the assessment, this research resulted in 3 recommendations for Scrum artifacts, 4 recommendations for Scrum events, 2 recommendations for Scrum supporting components, and 5 recommendations for the root causes of the research. This research also includes change steps that companies can implement to improve the Scrum process flow regarding Scrum events and artifacts. Recommendations and change steps are expected to be able to improve the achievement of the sprint targets to enable the timely release of software projects and achieve the expected business value of the company."
Jakarta: Fakultas Ilmu Komputer Universitas Indonesia, 2021
TA-pdf
UI - Tugas Akhir  Universitas Indonesia Library
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Natterer, Frank, 1941-
"This book provides a unified view of tomographic techniques, a common mathematical framework, and an in-depth treatment of reconstruction algorithms. It focuses on the reconstruction of a function from line or plane integrals, with special emphasis on applications in radiology, science, and engineering. The Mathematics of Computerized Tomography covers the relevant mathematical theory of the Radon transform and related transforms and also studies more practical questions such as stability, sampling, resolution, and accuracy. Quite a bit of attention is given to the derivation, analysis, and practical examination of reconstruction algorithms, for both standard problems and problems with incomplete data."
Philadelphia: Society for Industrial and Applied Mathematics, 2001
e20443315
eBooks  Universitas Indonesia Library
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Universitas Indonesia, 2003
S28726
UI - Skripsi Membership  Universitas Indonesia Library
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Siahaan, Ferdinan Manuel
"X-ray computed tomography (CT) has been playing an important role in current medical practice for diagnostic procedure. Beside its delicate technology, the 'hidden' software of CT image reconstruction has contributed almost half of total cost of a CT-scanner unit. Since Algebraic Reconstruction Technique (ART) is a basic to understand an iterative method of CT image reconstruction algortihm, and since it is difficult to find a clear description of fan beam ART algorithm in university literatures, it is important to develop an own algorithm and to begin a basic systematic research of this iterative method. After a long term of trial and error work, the research had succeded in developing an ART algorithm for third generation CT image reconstruction. By comparing the result of the research with more popular technique like Filtered Back Projection (FBP), the algorithm has been proved applicable to reconstruct a low dimension object matrix (32x32 and 64x64). By the resulted computer program, then basically a simple and low cost third generation CT-scanner can be designed for medical physics or biomedical imaging research. Finding a way of shortening the massive number of iterations process then, will be able to open the possibility of using the software for higher object matrix dimensions."
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2008
T21394
UI - Tesis Open  Universitas Indonesia Library
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"Since the improvement in radiotherapy impacts on cancers at their most curable stages, radiotherapy-related research has a high strategic priority and a great capacity for improving the overall cure rates of the disease. However, some of the treatments involve the delivery of relatively high radiation dose to patients. Thus, it is important to be able to verify the success of the treatment by determining the dose deposited in the patient at each fraction. One possibility to achieve this would be to obtain an image while the patient is on the treatment couch. The aim of this study was to develop an image reconstruction algorithm by collecting limited information while the patient is on the treatment couch. Two methods, image correlation and projection correlation, were developed and compared here. The effectiveness and practicality of each of these methods were compared. The results showed that the projection correlation presents several advantages. It can be applied without any interations, and it produces a fast algorithm. With more advanced image reconstruction software, this method could potentially be used in a clinical environment."
610 JKY 17: 2 (2009)
Artikel Jurnal  Universitas Indonesia Library
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