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PET versus SPECT: strengths, limitations and challenges
The recent introduction of high-resolution molecular imaging technology is considered by many experts as a major breakthrough that will potentially lead to a revolutionary paradigm shift in health… Expand
Design and performance evaluation of a whole-body Ingenuity TF PET-MRI system.
- H. Zaidi, N. Ojha, +7 authors L. Shao
- Materials Science, Medicine
- Physics in medicine and biology
- 21 May 2011
The Ingenuity TF PET-MRI is a newly released whole-body hybrid PET-MR imaging system with a Philips time-of-flight GEMINI TF PET and Achieva 3T X-series MRI system. Compared to PET-CT, modifications… Expand
A novel fuzzy C-means algorithm for unsupervised heterogeneous tumor quantification in PET.
PURPOSE Accurate and robust image segmentation was identified as one of the most challenging issues facing PET quantification in oncological imaging. This difficulty is compounded by the low spatial… Expand
PET-guided delineation of radiation therapy treatment volumes: a survey of image segmentation techniques
- H. Zaidi, I. El Naqa
- Computer Science, Medicine
- European Journal of Nuclear Medicine and…
- 25 March 2010
Historically, anatomical CT and MR images were used to delineate the gross tumour volumes (GTVs) for radiotherapy treatment planning. The capabilities offered by modern radiation therapy units and… Expand
Determination of the attenuation map in emission tomography.
Reliable attenuation correction methods for quantitative emission CT (ECT) require accurate delineation of the body contour and often necessitate knowledge of internal anatomic structure. Two broad… Expand
Relevance of accurate Monte Carlo modeling in nuclear medical imaging.
- H. Zaidi
- Physics, Medicine
- Medical physics
- 1 April 1999
Monte Carlo techniques have become popular in different areas of medical physics with advantage of powerful computing systems. In particular, they have been extensively applied to simulate processes… Expand
An outlook on future design of hybrid PET/MRI systems.
Early diagnosis and therapy increasingly operate at the cellular, molecular, or even at the genetic level. As diagnostic techniques transition from the systems to the molecular level, the role of… Expand
Magnetic resonance imaging-guided attenuation and scatter corrections in three-dimensional brain positron emission tomography.
Reliable attenuation correction represents an essential component of the long chain of modules required for the reconstruction of artifact-free, quantitative brain positron emission tomography (PET)… Expand
Partial Volume Correction Strategies in PET.
In the early days of PET, the partial volume effect (PVE) was identified as a serious factor affecting image quality and limiting the accuracy of quantitative analysis. Because of the limited spatial… Expand
Impact of miscentering on patient dose and image noise in x-ray CT imaging: phantom and clinical studies.
- M. Habibzadeh, M. R. Ay, A. K. Asl, H. Ghadiri, H. Zaidi
- Physica medica : PM : an international journal…
- 1 July 2012
The operation of the bowtie filter in x-ray CT is correct if the object being scanned is properly centered in the scanner's field-of-view. Otherwise, the dose delivered to the patient and image noise… Expand