Background: The aim of this work was to study the feasibility of constructing a fast thorax model suitable for simulating lung motion due to respiration using only one CT dataset. Materials and Methods: For each of six patients with different thorax sizes, two sets of CT images were obtained in single-breath-hold inhale and exhale stages in the supine position. The CT images were then ...

Objective Dual energy radiography (DER) makes it possible to obtain separate images for soft-tissue and bony structures (tissue maps) based on the acquisition of two radiographs at different source peak-kilovoltage values. Current DER studies are weighted subtraction method, which requires either manual tuning or use precomputed tables, decomposition methods, make a calibration model bone compo...

Two algorithms for solving misalignment issues in penalized PET/CT reconstruction using anatomical priors are proposed. Both approaches based on a recently published joint motion estimation and image method. The first approach deforms the to align it with functional one while second both images them measured data. Our current implementation alternates between alignment reconstruction. We have c...

OBJECTIVE To assess the breast dose during a routine thoracic cone-beam CT (CBCT) check with the efforts to explore the possible dose reduction strategy. MATERIALS AND METHODS Metal oxide semiconductor field-effect transistor (MOSFET) dosimeters were used to measure breast surface doses during a thorax kV CBCT scan in an anthropomorphic phantom. Breast doses for different scanning protocols a...

The Radiological Physics Center (RPC) developed two heterogeneous anthropomorphic quality assurance phantoms for use in verifying the accuracy of radiation delivery: one for intensity-modulated radiation therapy (IMRT) to the pelvis and the other for stereotactic body radiation therapy (SBRT) to the thorax. The purpose of this study was to describe the design and development of these two phanto...

For PET and SPECT, it is important to obtain accurate attenuation ( ) maps of thorax under conditions where counts are low. We previously proposed (Hsiao, Rangarajan, Gindi; Proc. IEEE Med. Img. Conf., 1998) a Bayesian reconstruction method in which the prior is base on a gamma mixture model. This method models the object as comprising attenuation coefficients that cluster into few (e.g. soft t...

how to cite this article: poor zamany nejat kermany m, modirian e, soroush m, masoumi m, hosseini m. phantom limb sensation (pls) and phantom limb pain (plp) among young landmine amputees. iran j child neurol. summer 2016; 10(3):42-47.   abstract objective to determine the frequency of phantom limb sensation (pls) and phantom limb pain (plp) in children and young adults suffering landmine-relat...

4D computed tomography (4D-CT) is an important modality in medical imaging due to its ability to resolve patient anatomy motion in each respiratory phase. Conventionally 4D-CT is accomplished by performing the reconstruction for each phase independently as in a CT reconstruction problem. We propose a new 4D-CT reconstruction algorithm that explicitly takes into account the temporal regularizati...