Artifacts and thresholding in X-ray CT of a cortical bone and titanium composite.


PURPOSE:X-Ray CT has the potential to provide precise and accurate data from which the mechanical properties of bone can be calculated. Such data would be useful in understanding the response of bone tissue to implants. Various artifacts can, however, degrade accuracy of the data. The aim of this study was to measure the artifactual errors produced in CT of a simulated femoral bone-titanium composite and to propose a method to correct for them. METHOD:A composite phantom that simulates cortical bone and a titanium implant was designed and constructed. The phantom was scanned and the image data were analyzed over a range of thresholds with image analysis software developed for this study. The outer (OD) and inner (ID) diameter and the CT number of the cortical bone, with and without titanium, were measured over a range of cortical thicknesses. RESULTS:While ID can be accurately measured by choosing the proper threshold (800 HU), OD, even at optimal threshold, will be underestimated by approximately 2%. If a proper threshold is selected, CT number can also be accurately determined. Errors of up to 5%, however, are produced by titanium unless corrected by proper threshold selection. CONCLUSION:Intramedullary titanium is not a deterrent to obtaining accurate measurements of cortical bone dimensions and properties. Proper choice of thresholds for image analysis of CT scan data can yield accuracy and precision of < or = 2%.


J Comput Assist Tomogr


Sutherland CJ,Gayou DE




Has Abstract


1996-05-01 00:00:00












  • Computer assisted tomography of orbital lesions in Wegener's granulomatosis.

    abstract::The orbital lesions in six patients with Wegener's granulomatosis were studied by computer assisted tomography (CAT). Four patients had active orbital disease and proptosis, and each was found to have orbital masses accompanied by varying degrees of bone and sinus destruction. Two additional patients with histories of...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Vermess M,Haynes BF,Fauci AS,Wolff SM

    更新日期:1978-01-01 00:00:00

  • Continuous Versus Sequential Acquisition Head Computed Tomography: A Phantom and Clinical Image Quality Comparative Study.

    abstract:OBJECTIVE:Sequential computed tomography (CT) technique remains the most common protocol for CT evaluation of the head despite nearly universal adoption of continuous technique for all other body parts. This may be attributable to the belief by radiologists that this technique is superior to helical scanning uniquely f...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Davis AJ,Ozsvath J,Vega E,Babb JS,Hagiwara M,George A

    更新日期:2015-11-01 00:00:00

  • Craniofacial melorheostosis.

    abstract::Melorheostosis is a rare benign disease of cortical bone most frequently presenting as peripheral hyperostosis with a characteristic "melting wax" appearance on conventional radiographs. The disease most frequently affects the appendicular skeleton and is seen only rarely in the craniofacial bones. We discuss a case o...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: McDermott M,Branstetter BF 4th,Seethala RR

    更新日期:2008-09-01 00:00:00

  • Achilles tendon injuries: the role of MR imaging.

    abstract::Eight magnetic resonance (MR) examinations were performed in seven patients with Achilles tendon injuries and correlated with physical examination and surgical and clinical follow-up. The MR examinations depicted the Achilles tendon in excellent detail and Achilles tendon abnormalities with greater accuracy than physi...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Marcus DS,Reicher MA,Kellerhouse LE

    更新日期:1989-05-01 00:00:00

  • Feasibility of 3-dimensional sampling perfection with application optimized contrast sequence in the evaluation of patients with hydrocephalus.

    abstract:PURPOSE:This study aimed to investigate the effectiveness and additive value of T2W 3-dimensional sampling perfection with application optimized contrast (3D-SPACE) with variant flip-angle mode in imaging of all types of hydrocephalus. Our secondary objective was to assess the reliability of 3D-SPACE sequence and corre...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Kartal MG,Ocakoglu G,Algin O

    更新日期:2015-05-01 00:00:00

  • Fluid tagging for CT colonography: effectiveness of a 2-hour iodinated oral preparation after incomplete optical colonoscopy.

    abstract:OBJECTIVE:To evaluate the distal extent and attenuation of bowel opacification achieved after administration of a single low volume dose of oral contrast 2 hours before computed tomographic colonography (CTC) after incomplete optical colonoscopy. METHODS:This retrospective study included 144 patients undergoing CTC af...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章,多中心研究


    authors: Chang KJ,Rekhi SS Jr,Anderson SW,Soto JA

    更新日期:2011-01-01 00:00:00

  • CT angiography in the rapid triage of patients with hyperacute stroke to intraarterial thrombolysis: accuracy in the detection of large vessel thrombus.

    abstract:PURPOSE:The purpose of this work was to evaluate the accuracy of CT angiography (CTA) for the detection of large vessel intracranial thrombus in clinically suspected hyperacute (<6 h) stroke patients. METHOD:Forty-four consecutive intraarterial thrombolysis candidates underwent noncontrast CT followed immediately by C...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Lev MH,Farkas J,Rodriguez VR,Schwamm LH,Hunter GJ,Putman CM,Rordorf GA,Buonanno FS,Budzik R,Koroshetz WJ,Gonzalez RG

    更新日期:2001-07-01 00:00:00

  • Quantification of cord deformation and dynamics during flexion and extension of the cervical spine using MR imaging.

    abstract::The magnetic resonance (MR) cine display of flexion and extension (F/E) manoeuvres in the cervical spine has proved useful in the evaluation of cord compression due to bone and joint instability, spondylosis, and multiple tumours. It has advantages over X-ray F/E and CT myelography in that it is noninvasive and produc...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Condon BR,Hadley DM

    更新日期:1988-11-01 00:00:00

  • MR assessment of normal brain development in neonates and infants: comparative study of T1- and diffusion-weighted images.

    abstract:PURPOSE:This study was designed to compare the sensitivity of T1- and diffusion-weighted images for the assessment of brain maturation in human brains. METHODS:T1- and diffusion-weighted images were obtained in 32 children without neurological abnormalities or growth retardation. The ages at which signal intensity cha...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Takeda K,Nomura Y,Sakuma H,Tagami T,Okuda Y,Nakagawa T

    更新日期:1997-01-01 00:00:00

  • Primary cardiac lymphoma: CT and MR findings.

    abstract::Primary cardiac lymphomas, defined as those involving only the heart and pericardium, are extremely rare tumors. These tumors are commonly fatal and until recently were rarely diagnosed antemortem. We describe the CT and MR findings in a case of primary lymphoma of the heart currently responding to chemotherapy. ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Dorsay TA,Ho VB,Rovira MJ,Armstrong MA,Brissette MD

    更新日期:1993-11-01 00:00:00

  • Image quality in cranial computed tomography.

    abstract::Image quality in cranial computed tomography (CT) was evaluated with phantom and patient studies on both a first (single beam) and a second (multiple beam) generation scanner. When comparable radiation doses were used, there were only minor differences in resolution, low contrast detectability, and noise level. The pa...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Zatz LM

    更新日期:1978-07-01 00:00:00

  • Computed tomography in olfactory neuroblastoma: one case of esthesioneuroepithelioma and four cases of esthesioneuroblastoma.

    abstract::Five cases of histologically confirmed olfactory neuroblastoma (esthesioneuroblastomas) have been studied by computed tomography (CT). Both the clinical symptoms (in particular, unilateral nasal obstruction and recurring epistaxis) and radiological findings (opacity of the paranasal sinuses) are nonspecific. Computed ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Manelfe C,Bonafé A,Fabre P,Pessey JJ

    更新日期:1978-09-01 00:00:00

  • Deep-frozen biologic phantom for performance evaluation of CT scanners.

    abstract::A test method with use of a biologic phantom--a deep-frozen specimen of a human cadaver--was developed in an attempt to simulate the clinical setting in CT of the spine. The quality of both soft tissue and bone images in the absence of motion artifacts was evaluated for seven scanner models. Special attention was paid...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Moström U,Bergström K,Pech P,Ytterbergh C

    更新日期:1986-11-01 00:00:00

  • Impact of the Number of Cores on the Prostate Cancer Detection Rate in Men Undergoing in-Bore Magnetic Resonance Imaging-Guided Targeted Biopsies.

    abstract:OBJECTIVE:To determine the incremental detection rate of clinically significant prostate cancer (csPCa) provided by sequential cores during in-bore magnetic resonance imaging (MRI)-guided prostate biopsies. METHODS:Single-center, retrospective interpretation of prospectively acquired data in men without previous diagn...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Subramanian N,Recchimuzzi DZ,Xi Y,Diaz de Leon A,Chen H,Xie D,Goldberg K,Rofsky NM,Pedrosa I,Costa DN

    更新日期:2020-12-02 00:00:00

  • "Incomplete ring" sign: a simple method for CT detection of spondylolysis.

    abstract::Multiple authors have pointed out the difficulty of detecting spondylolysis with lumbar CT. A simple method to detect spondylolysis on lumbar CT is described. Identifying one intact cortical ring for each vertebra absolutely excludes the diagnosis obviating the time-consuming need to search each image looking for posi...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Langston JW,Gavant ML

    更新日期:1985-07-01 00:00:00

  • Computed tomography evaluation of pelvic organ prolapse. Techniques and applications.

    abstract:OBJECTIVES:Pelvic organ prolapse is a common debilitating condition affecting women. Cross-sectional imaging with magnetic resonance imaging (MRI) depicts pelvic floor anatomy as well as organ prolapse and can complement or replace fluoroscopy. Occasionally, patients cannot tolerate MRI, but multiplanar visualization o...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Pannu HK,Genadry R,Kaufman HS,Fishman EK

    更新日期:2003-09-01 00:00:00

  • Dynamic computed tomographic evaluation of vocal cord mobility in patients with larynx cancer.

    abstract:OBJECTIVE:To evaluate the accuracy of dynamic laryngeal computed tomography (DLCT) for the detection of vocal cord mobility in larynx cancer. METHODS:Vocal cord mobility of 44 patients (36 men; age range, 49-81 years) with larynx cancer was examined; 13 patients were excluded (owing to poor image quality or bilateral ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Celebi I,Mahmutoglu AS,Vural C,Bankaoglu M,Caliskan KC,Erturk SM,Basak M

    更新日期:2012-07-01 00:00:00

  • Computed tomography and magnetic resonance of pseudomyxoma peritonei.

    abstract::Computed tomographic and magnetic resonance (MR) findings in a case of pseudomyxoma peritonei arising from a mucoid cystadenoma of the ovary are presented. The possible diagnostic aid of MR is discussed. ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Weigert F,Lindner P,Rohde U

    更新日期:1985-11-01 00:00:00

  • Pancreatic beta-cell tumors: MRI.

    abstract::Ten consecutive patients with surgically proven beta-islet cell tumors, strongly suspected clinically because of positive laboratory findings, were studied by MRI at 0.5 T. Results were correlated with CT and angiography. MRI detected all 10 insulinomas, with the location confirmed at surgery. Lesion size was < 1 cm i...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Pavone P,Mitchell DG,Leonetti F,Di Girolamo M,Cardone G,Catalano C,Tamburrano G,Passariello R

    更新日期:1993-05-01 00:00:00

  • MR imaging of Pelizaeus-Merzbacher disease.

    abstract::Pelizaeus-Merzbacher disease (PMD) is a rare, slowly progressive, sex-linked demyelinating disorder generally classified with the sudanophilic leukodystrophies. The onset is most often in the pediatric age group and may be diagnosed as cerebral palsy because of the subtle onset. Cranial magnetic resonance (MR) imaging...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Penner MW,Li KC,Gebarski SS,Allen RJ

    更新日期:1987-07-01 00:00:00

  • Conventional and Advanced Magnetic Resonance Imaging Features of Supratentorial Extraventricular Ependymomas.

    abstract:OBJECTIVE:To describe the magnetic resonance imaging characteristics of supratentorial ependymomas. METHODS:The magnetic resonance imaging and computed tomography imaging characteristics of 49 cases of supratentorial ependymomas were analyzed retrospectively. The location, size, degree of perilesional edema, gross app...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Jabeen S,Konar SK,Prasad C,Mahadevan A,Beniwal M,Sadashiva N,Santosh V,Saini J

    更新日期:2020-09-01 00:00:00

  • Craniospinal enterogenous cyst: MR findings.

    abstract::An enterogenous cyst of the craniocervical region producing anterior medullary compression is reported. The patient presented with quadriparesis with greater involvement of the upper limbs. Computed tomography showed a high attenuation intradural extramedullary mass located anteriorly. Magnetic resonance imaging demon...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Kak VK,Gupta RK,Sharma BS,Banerjee AK

    更新日期:1990-05-01 00:00:00

  • Head holder for PET, CT, and MR studies.

    abstract::A new head holder for the fixation and repositioning of the patient head in PET, CT, and MR scanners has been designed and tested. With this device, a bidimensional correlation between functional and anatomical brain images can also be obtained. Head fixation and repositioning are achieved using the patient's dental m...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Bettinardi V,Scardaoni R,Gilardi MC,Rizzo G,Perani D,Paulesu E,Striano G,Triulzi F,Fazio F

    更新日期:1991-09-01 00:00:00

  • A probabilistic ribbon model for shape analysis of the cerebral sulci: application to the central sulcus.

    abstract:PURPOSE:An approach for quantifying the shapes of the cerebral sulci is presented, utilizing a probabilistic geometric model, and it is applied to the central sulcus. METHOD:The geometric structure of the central sulcus is determined from a set of outlines on cross-sectional images and is used by a procedure that auto...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Manceaux-Demiau A,Bryan RN,Davatzikos C

    更新日期:1998-11-01 00:00:00

  • CT demonstration of extracranial carotid artery aneurysms.

    abstract::Aneurysms arising from the extracranial carotid arteries are uncommon lesions. Clinically, they may present as lateral masses in the superior cervical area, as medial masses in the tonsillar fossa or parapharyngeal region, or as a mass palpable in both areas. Tenderness or pain may or may not be present. Pulsation is ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Duvall ER,Gupta KL,Vitek JJ,Stanley RJ,Luna RF,Howieson J

    更新日期:1986-05-01 00:00:00

  • The target sign: a CT finding in tumors of the corpus callosum.

    abstract::An unusual computed tomography finding, the "target sign," is demonstrated in a patient with a corpus callosum tumor mass extending to the right lateral ventricle. The central low attenuation of the "target" is produced by the isolated part of the dilated lateral ventricle surrounded by tumor tissue, the dense area of...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: El Gammal T,McDaniel FE

    更新日期:1979-08-01 00:00:00

  • Hepatic involvement in hereditary hemorrhagic telangiectasia: helical computed tomography features in 24 consecutive patients.

    abstract:OBJECTIVE:Among the various organs that may be affected by hereditary hemorrhagic telangiectasia (HHT), the liver can show various degrees of vascular and parenchymal involvement. The purpose of this prospective study comprising a large series of patients was to reassess the computed tomography (CT) features of hepatic...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Ravard G,Soyer P,Boudiaf M,Terem C,Abitbol M,Yeh JF,Brouard R,Hamzi L,Rymer R

    更新日期:2004-07-01 00:00:00

  • The quality of 3D reconstructions from 1.0 and 1.5 pitch helical and conventional CT.

    abstract:PURPOSE:CT data are commonly used to create 3D images. For this purpose, thin and overlapped slices are desirable. Helical (spiral) CT offers the ability to adjust the slice reconstruction interval from 0 to 100%. However, its use in 1.0 and 1.5 pitch helical CT and 3D imaging, especially with respect to surface detail...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Hopper KD,Pierantozzi D,Potok PS,Kasales CJ,TenHave TR,Meilstrup JW,Van Slyke MA,Mahraj R,Westacott S,Hartzel JS

    更新日期:1996-09-01 00:00:00

  • CT appearance of primary CNS lymphoma in patients with acquired immunodeficiency syndrome.

    abstract::Cranial CT studies of 32 patients with biopsy-proven AIDS-related primary CNS lymphoma were reviewed retrospectively. A wide variety of different CT appearances were identified. Mass lesions varied in location, size, and number. Most lesions were either iso- or hyperdense and all enhanced with contrast medium. Several...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Goldstein JD,Zeifer B,Chao C,Moser FG,Dickson DW,Hirschfeld AD,Davis L

    更新日期:1991-01-01 00:00:00

  • Contrast-enhanced fluid-attenuated inversion recovery MRI is useful to detect the CSF dissemination of glioblastoma.

    abstract::We present three cases of glioblastoma with CSF dissemination that contrast-enhanced fluid-attenuated inversion recovery MRI was sensitive enough to detect compared with contrast-enhanced T1-weighted MRI. An autopsy was performed on one patient, and its histologic findings proved the existence of CSF dissemination. ...

    journal_title:Journal of computer assisted tomography

    pub_type: 杂志文章


    authors: Misaki K,Nakada M,Hayashi Y,Tachibana O,Yamashita J,Ueda F,Suzuki M

    更新日期:2001-11-01 00:00:00