Nima Gilani

Nima Gilani
NYU Langone Health

PhD
Postdoctoral Fellow

About

12
Publications
2,733
Reads
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65
Citations
Additional affiliations
November 2013 - December 2016
University of East Anglia
Position
  • PhD Student

Publications

Publications (12)
Article
Purpose Diffusion MRI is used frequently to assess prostate cancer. The prostate consists of cellular tissue surrounding fluid filled ducts. Here, the diffusion properties of the ductal fluid alone were studied. Monte Carlo simulations were used to investigate ductal residence times to determine whether ducts can be regarded as forming a separate c...
Article
Full-text available
Mono-exponential kurtosis model is routinely fitted on diffusion weighted, magnetic resonance imaging data to describe non-Gaussian diffusion. Here, the purpose was to optimize acquisitions for this model to minimize the errors in estimating diffusion coefficient and kurtosis. Similar to a previous study, covariance matrix calculations were used, a...
Article
Full-text available
Purpose: Quantitative diffusion MRI has frequently been studied as a means of grading prostate cancer. Interpretation of results is complicated by the nature of prostate tissue, which consists of four distinct compartments: vascular, ductal lumen, epithelium, and stroma. Current diffusion measurements are an ill-defined weighted average of these c...
Article
PurposeTo determine the echo times that provide the greatest precision in measurements of prostate T2s. T2 relaxation time measurements in the prostate are complicated by the structure of prostate tissue, which consists of fluid-filled glands surrounded by epithelial and stromal cells. Since the glands are large relative to diffusion distances, the...
Thesis
Purpose A large proportion of the diagnosed prostate cancer patients are suffering from low grade or indolent tumours. Transrectal ultrasound guided biopsy which is conventionally used as the means of diagnosis has a weak correlation with cancer grade or aggressiveness because of its random sampling nature, so that many indolent tumours are treated...
Conference Paper
Full-text available
T2-weighted MR signal of the cartilage knee has shown to be better explained by the biexponential relaxation model. The short and long T2 signal components presumably describe tightly bound and loosely bound macromolecular water components of the knee, respectively. More precise estimation of these two parameters might help in the better diagnosis...
Preprint
Full-text available
Purpose Neurodegenerative diseases such as Alzheimer’s disease cause changes and disruption to cortical microstructure and architecture. Diffusion MRI (dMRI) could potentially be sensitive to such changes. There is a growing interest in modeling of human cortical areas using a combination of quantitative MRI and 3D microscopy. The purpose of this s...
Article
Full-text available
Tissue water diffusion is non-Gaussian and the expressions used to calculate diffusion parameters are approximations which introduce systematic errors dependent on the maximum diffusion encoding, diffusion time, etc. This study aimed at characterizing biases in estimates of both apparent diffusion coefficient and kurtosis, and determines their depe...
Article
The purpose of this work was to refine a previously published model of prostate diffusion by incorporating improved estimates of cellular diffusivity obtained by Monte Carlo simulation. Stromal and epithelial cell size and intracellular volume fraction in different grades of cancer were determined from histological images. Diffusion in different mi...
Poster
Full-text available
Quantitative diffusion measurements of the prostate have been inconsistent in studies performed over a decade. Few attempts have so far been made to explain prostate diffusion in terms of the biophysics of the underlying tissue. In this paper we introduce a biophysically plausible model that explains previously published measurements of benign and...
Poster
Full-text available
Quantitative measurements of biexponential signal decays are well known to be highly sensitive to acquisition noise. Fleysher et al. [1] introduced the use of covariance matrix methods to finding optimum protocols for monoexponential T2 measurements. This work was later extended to biexponential T2 measurements by Gilani et al. [2]. Here this metho...
Thesis
Full-text available
Varian Clinac 2100 accelerator head was simulated using EGS5 Monte Carlo code. Phase space method was applied to this simulation. Two phase space plates were used in these simulations; one was inserted before the moveable jaws and the other one was placed after the jaws. The first plate was simulated for energy. And the second plate was to simulate...

Questions

Questions (2)
Question
High amp power electronics devices such as KBPC1006 are connected to the whole circuit using female Faston connectors. My question is what is the proper female connector for other high amp devices such as IRL520NPBF where the pins are smaller. I am looking for the name of these plugs.
In other words:
Suppose there is a low voltage controller PCB and you need to control high amp power electronics devices using this controller. How would you recommend connecting the controller and power electronics devices in a very tidy and professional manner? (putting the high amp device burns the PBC) For Faston connections it seems to be easy but what about devices similar to IRL520NPBF with smaller pins?
-Pictures appreciated,
-Connector terminology list appreciated.
Question
It is easy to use a step down transformer and then feed this to the controller to measure the phase of the grid for example. I am looking for an alternative method which solely uses power electronics without the step down transformer.
All I care about is the phase of the voltage. But extension to current phase measurements would also be welcomed.
The cheaper the better, I assume using power electronics would be cheaper than buying a transformer. Efficiency matters too, I could use some resistance voltage dividers but what else?
I found these to be helpful:
"In its simplest form, a suitable PLL structure relies on a zero-crossing detector on the grid waveform and a counter to measure the time between zero crossings — adjusting inverter output as needed to match grid-voltage zero crossings (Figure 2). Designers can implement this simple PLL using a differential op amp such as the Maxim Integrated MAX9939, Microchip Technology MCP6022T, or Texas Instruments THS4121CD to trigger the next cycle of the sinusoidal output waveform from a reference sine-wave generator implemented in hardware or software."
What is the best power electronics scheme for voltage phase measurement? - ResearchGate. Available from: https://www.researchgate.net/post/What_is_the_best_power_electronics_scheme_for_voltage_phase_measurement#581e566b3d7f4bf3d262c371 [accessed Nov 5, 2016].
I am still looking for the name of power electronics ICs that work similar to this one http://www.avrfreaks.net/sites/default/files/zerocrossingdetector.gif
In all of these it is easy to see how zero crossing happen after using  a transformer but it seems that this operation definitely needs the transformer ...
I know the transformer isolates the circuits. More specifically, I am looking for a phase detector IC which could be optocoupled later, I think there is not such a thing!

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Projects

Project (1)
Project
Developing biophysically plausible models of diffusion in the prostate to improve diagnosis of prostate cancer.