Gated (4D) PET/CT has the potential to greatly improve the accuracy of radiotherapy at treatment sites where internal organ motion is significant. However, the best methodology for applying 4D-PET/CT to target definition is not currently well established. With the goal of better understanding how to best apply 4D information to radiotherapy, initial studies were performed to investigate the eff...

objective(s): in clinical practice, approximately 10-25% of post-surgical differentiated thyroid carcinoma (dtc) patients with high serum thyroglobulin (tg) and negative 131i whole-body scan (wbs) have poor prognosis due to recurrent or metastatic lesions after radioactive iodine treatment. the purpose of this study was to evaluate the value of 18f-fdg pet/ct scan in dtc patients with high seru...

Purpose: We present a method that allows one to generate data from nasopharyngoscopy videos into a form suitable for use in radiation treatment planning, as well as for review of the data itself as a 3D object. Methods and Materials: The accurate transfer of data from endoscopic video frames to the planning CT requires an explicit endoscopic video/CT registration. Our approach to accomplishing ...

  Introduction: Geometric distortion is a major shortcoming of magnetic resonance imaging (MRI), which has an important influence on the accuracy of volumetric measurements, an important parameter in neurology and oncology. Our goal is to design and construct a new three- dimensional phantom using a 3D printer in order to measure geometric distortion and its reproducibility in...

BACKGROUND Three-dimensional (3D) visualization is thought to improve the anatomical understanding of clinicians, thus improving patient safety. CASE PRESENTATION A 58-year-old male was admitted to our hospital in April 2007 with a suspected metastasis of a sigmoid cancer in the Couinaud segment (CS) 7. The anatomical situation of this patient was analyzed using both a CT scan and 3D images. ...

Computerized Tomography(CT) scan plays an important role in the diagnosis and treatment of sinus skull base lesions. The CT image distinctly provides detail bony anatomy, anatomical variation, extent diseases, differentiates between inflammatory, benign, malignant pathology.1 It is aspect imaging that helps not only diagnostic but also rules out other pathology designing surgical plan by 3D-MPR...

background outcome determination of head trauma is important for medical decision-making. to determine the consequences by using ct findings, the marshall and rotterdam criteria were introduced. few studies have been conducted to determine the diagnostic value of the rotterdam criteria. objective this study assesses the diagnostic value of the rotterdam criteria score with early outcome for tra...

background : glenoid bone damages consisting of anterior rim erosion and bony avulsion are very important in decision making for treatment of recurrent dislocation in shoulder joint. this study was aimed to determine the prevalence of these damages in patients with anterior recurrent shoulder dislocation. methods : the study was a cross-sectional study evaluating patients with unstable shoulder...

Fast variance prediction for iteratively-reconstructed helical CT images is useful for analysis of resulting images and potentially for dynamic dose adjustment during a scan. Previous methods require impractical computation times to approximate the image variance; other methods are able to approximate variance quickly but only for specific CT geometries, excluding 3D helical CT. In this paper w...

how to cite this article: fallah r, nafisi moghadam r, fallah tafti m, salmani nodoushan m. results of noncontrast brain computed tomography scans of 1-18 year old epileptic children. iran j child neurol 2012; 6(3): 33-38. objective the advent of computed tomography (ct) scan revolutionized the diagnosticevaluation of neurologic patients. the aim of this study was to evaluate brain ctresults of...