MyMedR

Wavelet energy-guided level set-based active contour: a segmentation method to segment highly similar regions

Achuthan A, Rajeswari M, Ramachandram D, Aziz ME, Shuaib IL

Comput Biol Med, 2010 Jul;40(7):608-20.

PMID: 20541182 DOI: 10.1016/j.compbiomed.2010.04.005

This paper introduces an approach to perform segmentation of regions in computed tomography (CT) images that exhibit intra-region intensity variations and at the same time have similar intensity distributions with surrounding/adjacent regions. In this work, we adapt a feature computed from wavelet transform called wavelet energy to represent the region information. The wavelet energy is embedded into a level set model to formulate the segmentation model called wavelet energy-guided level set-based active contour (WELSAC). The WELSAC model is evaluated using several synthetic and CT images focusing on tumour cases, which contain regions demonstrating the characteristics of intra-region intensity variations and having high similarity in intensity distributions with the adjacent regions. The obtained results show that the proposed WELSAC model is able to segment regions of interest in close correspondence with the manual delineation provided by the medical experts and to provide a solution for tumour detection.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Intracerebral haematomas after deep brain stimulation surgery in a patient with Tourette syndrome and low factor XIIIA activity

Idris Z, Ghani AR, Mar W, Bhaskar S, Wan Hassan WN, Tharakan J, et al.

J Clin Neurosci, 2010 Oct;17(10):1343-4.

PMID: 20620064 DOI: 10.1016/j.jocn.2010.01.054

A 24-year-old male patient with refractory Tourette syndrome was treated with deep brain stimulation (DBS) and developed subsequent bilateral subcortical haematomas. Additional blood tests revealed abnormalities of plasma factor XIIIA and tryptophan levels, which may be associated with Tourette syndrome. Neurosurgeons who perform DBS surgery on patients with Tourette syndrome must be aware of possible disastrous complications resulting from factor XIIIA disorders of blood haemostasis. Routine screening for this condition is not typically performed prior to surgery in these patients.

Matched MeSH terms: Tomography, X-Ray Computed/methods

Internal morphometry of thoracic pedicles in the immature spine

Hassan E, Liau KM, Ariffin I, Halim Yusof A

Spine (Phila Pa 1976), 2010 Jun 1;35(13):1253-6.

PMID: 20461037 DOI: 10.1097/BRS.0b013e3181c1172b

A cross sectional study of thoracic pedicle morphometry in the immature spine of Malaysian population using reformatted computed tomographic (CT) images.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Disseminated tuberculosis infection: a 'super' 18F-FDG PET/CT appearance

Nordin AJ, Rossetti C, Rahim NA

Eur. J. Nucl. Med. Mol. Imaging, 2009 May;36(5):882.

PMID: 19296106 DOI: 10.1007/s00259-009-1107-z

Matched MeSH terms: Tomography, X-Ray Computed/methods

Morphological comparison between adolescent and adult lumbar pedicles using computerised tomography scanning

Mughir AM, Yusof MI, Abdullah S, Ahmad S

Surg Radiol Anat, 2010 Jul;32(6):587-92.

PMID: 20047027 DOI: 10.1007/s00276-009-0612-x

To study the morphological difference between the lumbar pedicle in adolescent and adult groups as only less information is known about their pedicle morphology, especially in Malaysian population.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Fulltext Clinical utility of 64-row multislice CT angiography in the detection of cerebral aneurysms in acute subarachnoid haemorrhage

Chang LK, Liew NS, Soh HL, Tan SZ, Wong SH

Med J Malaysia, 2008 Jun;63(2):131-6.

PMID: 18942299 MyJurnal

CT angiography (CTA) is a fast examination performed with a time-optimised contrast injection to enhance the cerebral arteries. Being a new imaging modality in our hospital, evaluation of the effectiveness of 64-row multislice CTA in detecting intracranial aneurysms in ruptured subarachnoid haemorrhage (SAH) cases is necessary. We conducted a descriptive prospective study by recruiting 30 consecutively operated SAH cases from May 2005 until November 2006. CTA findings were studied by radiologist and neurosurgeon and these were compared with operative findings. The sensitivity and specificity of CTA were 94.4% and 97.2% respectively. Approximately half of the patients were scanned within four hours and operated within 24 hours. In conclusion, CTA proves to be highly sensitive and specific in the diagnosis of intracranial aneurysms in our study.
KEY WORDS: Subarachnoid haemorrhage, Intracranial aneurysm, Computed tomography (CT), CT angiography (CTA), Sarawak

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Computed tomography scan for cardiac interventions

Sim KH, Ong TK, Chin SP, Wong M

Indian Heart J, 2007 Mar-Apr;59(2 Suppl B):B25-32.

PMID: 19153433

Matched MeSH terms: Tomography, X-Ray Computed/methods*

MRI and CT findings of cryptococcal vaginitis

Ranganathan S, Moosa F, Kamarulzaman A, Looi LM

Br J Radiol, 2005 Apr;78(928):353-4.

PMID: 15774599

Cryptococcus neoformans is a yeast like fungus, which is commonly found in bird droppings, especially pigeons. Most cases of cryptococcal infections occur in immunocompromised patients or in those who are on long term immunosuppressant therapies. Cryptococcal infection usually presents as a meningoencephalitis or a pulmonary infection. Skin, bone and genital infections are very rare. We report the second case of vaginal cryptococcossis to be reported in English literature and the first to be imaged with CT and MRI.

Matched MeSH terms: Tomography, X-Ray Computed/methods

Fulltext Surface Reconstruction from Parallel Curves with Application to Parietal Bone Fracture Reconstruction

Majeed A, Mt Piah AR, Ridzuan Yahya Z

PLoS One, 2016;11(3):e0149921.

PMID: 26967643 DOI: 10.1371/journal.pone.0149921

Maxillofacial trauma are common, secondary to road traffic accident, sports injury, falls and require sophisticated radiological imaging to precisely diagnose. A direct surgical reconstruction is complex and require clinical expertise. Bio-modelling helps in reconstructing surface model from 2D contours. In this manuscript we have constructed the 3D surface using 2D Computerized Tomography (CT) scan contours. The fracture part of the cranial vault are reconstructed using GC1 rational cubic Ball curve with three free parameters, later the 2D contours are flipped into 3D with equidistant z component. The constructed surface is represented by contours blending interpolant. At the end of this manuscript a case report of parietal bone fracture is also illustrated by employing this method with a Graphical User Interface (GUI) illustration.

Matched MeSH terms: Tomography, X-Ray Computed/methods

Proptosis--Correlation and Agreement between Hertel Exophthalmometry and Computed Tomography

Ramli N, Kala S, Samsudin A, Rahmat K, Abidin ZZ

Orbit, 2015;34(5):257-62.

PMID: 26186249 DOI: 10.3109/01676830.2015.1057291

To determine the correlation and agreement between Hertel exophthalmometry and computed tomography (CT) of the orbits in measuring proptosis.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Fulltext 3D multimodal cardiac data reconstruction using angiography and computerized tomographic angiography registration

Moosavi Tayebi R, Wirza R, Sulaiman PS, Dimon MZ, Khalid F, Al-Surmi A, et al.

J Cardiothorac Surg, 2015;10:58.

PMID: 25896185 DOI: 10.1186/s13019-015-0249-2

Computerized tomographic angiography (3D data representing the coronary arteries) and X-ray angiography (2D X-ray image sequences providing information about coronary arteries and their stenosis) are standard and popular assessment tools utilized for medical diagnosis of coronary artery diseases. At present, the results of both modalities are individually analyzed by specialists and it is difficult for them to mentally connect the details of these two techniques. The aim of this work is to assist medical diagnosis by providing specialists with the relationship between computerized tomographic angiography and X-ray angiography.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Loss of weight in a female heavy smoker with diffuse interstitial pulmonary fibrosis

Al-Adsani A, Dahniya MH, Al-Adsani N

Postgrad Med J, 2001 Feb;77(904):127, 137-8.

PMID: 11161092

Matched MeSH terms: Tomography, X-Ray Computed/methods

Wavelet-based compression of medical images: filter-bank selection and evaluation

Saffor A, bin Ramli AR, Ng KH

Australas Phys Eng Sci Med, 2003 Jun;26(2):39-44.

PMID: 12956184

Wavelet-based image coding algorithms (lossy and lossless) use a fixed perfect reconstruction filter-bank built into the algorithm for coding and decoding of images. However, no systematic study has been performed to evaluate the coding performance of wavelet filters on medical images. We evaluated the best types of filters suitable for medical images in providing low bit rate and low computational complexity. In this study a variety of wavelet filters are used to compress and decompress computed tomography (CT) brain and abdomen images. We applied two-dimensional wavelet decomposition, quantization and reconstruction using several families of filter banks to a set of CT images. Discreet Wavelet Transform (DWT), which provides efficient framework of multi-resolution frequency was used. Compression was accomplished by applying threshold values to the wavelet coefficients. The statistical indices such as mean square error (MSE), maximum absolute error (MAE) and peak signal-to-noise ratio (PSNR) were used to quantify the effect of wavelet compression of selected images. The code was written using the wavelet and image processing toolbox of the MATLAB (version 6.1). This results show that no specific wavelet filter performs uniformly better than others except for the case of Daubechies and bi-orthogonal filters which are the best among all. MAE values achieved by these filters were 5 x 10(-14) to 12 x 10(-14) for both CT brain and abdomen images at different decomposition levels. This indicated that using these filters a very small error (approximately 7 x 10(-14)) can be achieved between original and the filtered image. The PSNR values obtained were higher for the brain than the abdomen images. For both the lossy and lossless compression, the 'most appropriate' wavelet filter should be chosen adaptively depending on the statistical properties of the image being coded to achieve higher compression ratio.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Relapsed non-Hodgkin's lymphoma with high CA-125 mimicking ovarian tumour

Leong CF, Cheong SK, Ng P, Amran AR

Hosp Med, 2003 Nov;64(11):686-7.

PMID: 14671884

Matched MeSH terms: Tomography, X-Ray Computed/methods

Primary spontaneous pneumothorax in children: factors predicting recurrence and contralateral occurrence

Ng GYH, Nah SA, Teoh OH, Ong LY

Pediatr Surg Int, 2020 Mar;36(3):383-389.

PMID: 31993738 DOI: 10.1007/s00383-020-04619-x

BACKGROUND: The risk factors for recurrence in primary spontaneous pneumothorax (PSP) in children are not well known. We aimed to identify possible risk factors, and to evaluate the utility of computerised tomography (CT) scans in predicting future episodes.

METHODS: We reviewed children aged

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Value of CT pulmonary arteriography and venography in the evaluation of venous thromboembolism in a multiracial Asian population

Lee YJ, Zakaria R, Manaf ZA, Mohamed Z, Lee YY

Chin Med J (Engl), 2013;126(11):2049-53.

PMID: 23769556

There is increasing evidence that CT pulmonary arteriography and venography allow a better diagnostic yield for deep vein thrombosis (DVT) in suspected acute pulmonary embolism (PE). The aim was to investigate the value for using such an approach in a multiracial Asian population.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Fulltext A Double Whammy of Mycotic Aneurysms and Acquired Dysfibrinogenemia in a Patient with Septicemia

Sim CY, Khoo CS, Mustafar R, Chai JN

Balkan Med J, 2021 01;38(1):55-56.

PMID: 32720494 DOI: 10.4274/balkanmedj.galenos.2020.2020.5.208

Matched MeSH terms: Tomography, X-Ray Computed/methods

A rare case of unilateral postaxial duplicated foot in a developmentally normal child

Sahdi H, Hoong CW, Rasit AH, Arianto F, Siong LK, Abdullah NA

J Orthop Surg (Hong Kong), 2017 01;25(1):2309499016684989.

PMID: 28166702 DOI: 10.1177/2309499016684989

Diplopodia, being a rare congenital disorder, is infrequently discussed in published texts. Most reported cases have accounted the involvement of duplicated preaxial digits with other associated organ system and physical deformities. Here, we present an unusual case of isolated diplopodia involving postaxial toes in a child with no other organ and physical abnormalities. Radiological studies revealed a set of 10-digit-duplicated foot over the lateral aspect of the native foot, complete with phalanges and its corresponding metatarsals as well as tarsals, supplied by an anomalous posterior branch of the popliteal artery. Definitive surgery was performed just before the child was learning to walk.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

Computer-Assisted Diagnosis System for Breast Cancer in Computed Tomography Laser Mammography (CTLM)

Jalalian A, Mashohor S, Mahmud R, Karasfi B, Iqbal Saripan M, Ramli AR

J Digit Imaging, 2017 Dec;30(6):796-811.

PMID: 28429195 DOI: 10.1007/s10278-017-9958-5

Computed tomography laser mammography (Eid et al. Egyp J Radiol Nucl Med, 37(1): p. 633-643, 1) is a non-invasive imaging modality for breast cancer diagnosis, which is time-consuming and challenging for the radiologist to interpret the images. Some issues have increased the missed diagnosis of radiologists in visual manner assessment in CTLM images, such as technical reasons which are related to imaging quality and human error due to the structural complexity in appearance. The purpose of this study is to develop a computer-aided diagnosis framework to enhance the performance of radiologist in the interpretation of CTLM images. The proposed CAD system contains three main stages including segmentation of volume of interest (VOI), feature extraction and classification. A 3D Fuzzy segmentation technique has been implemented to extract the VOI. The shape and texture of angiogenesis in CTLM images are significant characteristics to differentiate malignancy or benign lesions. The 3D compactness features and 3D Grey Level Co-occurrence matrix (GLCM) have been extracted from VOIs. Multilayer perceptron neural network (MLPNN) pattern recognition has developed for classification of the normal and abnormal lesion in CTLM images. The performance of the proposed CAD system has been measured with different metrics including accuracy, sensitivity, and specificity and area under receiver operative characteristics (AROC), which are 95.2, 92.4, 98.1, and 0.98%, respectively.

Matched MeSH terms: Tomography, X-Ray Computed/methods*

A lung full of Cheerios

Kho SS, Yong MC, Chan SK, Tie ST

Thorax, 2018 10;73(10):994-995.

PMID: 29599199 DOI: 10.1136/thoraxjnl-2018-211729

Matched MeSH terms: Tomography, X-Ray Computed/methods

Displaying publications 41 - 60 of 120 in total