Radiographic manifestations of Mönckeberg arteriosclerosis in the head and neck region

Tahmasbi-Arashlow, Mehrnaz,Barghan, Sevin,Kashtwari, Deeba,Nair, Madhu K. Korean Academy of Oral and Maxillofacial Radiology 2016 Imaging Science in Dentistry Vol.46 No.1

$M{\ddot{o}}nckeberg$ sclerosis is a disease of unknown etiology, characterized by dystrophic calcification within the arterial tunica media of the lower extremities leading to reduced arterial compliance. Medial calcinosis does not obstruct the lumina of the arteries, and therefore does not lead to symptoms or signs of limb or organ ischemia. $M{\ddot{o}}nckeberg$ sclerosis most commonly occurs in aged and diabetic individuals and in patients on dialysis. $M{\ddot{o}}nckeberg$ arteriosclerosis is frequently observed in the visceral arteries, and it can occur in the head and neck region as well. This report describes a remarkable case of $M{\ddot{o}}nckeberg$ arteriosclerosis in the head and neck region as detected on dental imaging studies. To the best of our knowledge, this is the first case that has been reported in which this condition presented in the facial vasculature. The aim of this report was to define the radiographic characteristics of $M{\ddot{o}}nckeberg$ arteriosclerosis in an effort to assist health care providers in diagnosing and managing this condition.

Cone-beam computed tomographic imaging of central giant cell granuloma: A comprehensive review

Tahmasbi-Arashlow, Mehrnaz,Patel, Paras B.,Nair, Madhu K.,Liang, Hui,Cheng, Yi-Shing Lisa Korean Academy of Oral and Maxillofacial Radiology 2022 Imaging Science in Dentistry Vol.52 No.2

Purpose: The aim of this study was to characterize the cone-beam computed tomographic (CBCT) imaging features of central giant cell granuloma (CGCG) of the jawbone. Materials and Methods: This study retrospectively reviewed 26 CBCT studies of histologically proven cases of CGCG during a period of 20 years, from 1999 to 2019. Patients' demographic data were recorded, and radiographic features were assessed (location, border, cortication, appearance of the internal structure, locularity, septation, expansion, cortical perforation, effects on surrounding tissue, whether the lesion crossed the midline, and lesion volume). Results: In this study, CGCGs were seen almost twice as often in the mandible than in the maxilla, and 64.7% of mandibular lesions involved the anterior region. Only 26.9% of lesions crossed the midline, a feature that was considered characteristic of CGCG. Furthermore, 65.4% of lesions were unilocular and 34.6% were multilocular. The correlation between a lesion's size and its locularity was statistically significant, and larger lesions showed a multilocular appearance. The mean volume of multilocular lesions was greater than that of unilocular lesions. Conclusion: CGCGs showed variable radiographic features on CBCT, and this imaging modality is highly effective at demonstrating the radiographic spectrum and lesional extent of CGCGs in the jawbone.

Blood Malignancies in Mazandaran Province of Iran

Tahmasby, Bahram,Marnani, Ahmad Barati,Maleki, Mohammadreza,Barouni, Mohsen,Mousavi, Seyyed Hamid,Naseriyan, Behjat,Nazarnezhad, Mirzaali,Alizadeh, Ali,Sabermahani, Asma Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2

Background: Leukemia and lymphoma demonstrate significantly incidence rates throughout the world and particularly in Iran they cause serious mortality and diagnosis and treatment expenditures for both families and the health system. Combined they account for about 11 percent of cancers in Mazandaran province, ranking number 2 in prevalent cancers. The purpose of this study was to provide a first general and specific description of leukemia and lymphoma in Mazandaran province. Materials and Methods: In this descriptive retrospective study, entire patient's data were reviewed which had confirmed diagnosis of leukemia and lymphoma with valid laboratory or pathology reports in the period 2001-2008. The data were collected by Babol health research site related to Tehran University of Medical Science. Incidence rates based on age groups, gender, city of residence and type of malignancy were calculated and analyzed. Results: In Mazandaran province, 1,146 cases of leukemia and lymphoma were encountered, 5.9 in 100,000 persons on average annually. The highest incidence rates were obtained at age of 70 or above (26.4) and the lowest at age of 0-9 (2.3).The incidence rates in males and females were 7.1 and 4.8 respectively with a ratio of 1.5. The highest incidence rate was in Babol (7.3) and the lowest was calculated in Neka and Tonekabon equally (1.5). According to the type of malignancy, non Hodgkin lymphoma, with 2.5/100,000 have the most incidence rate and myeloid leukemia with 1.8 had the lowest. Conclusions: The obtained findings indicate clear differences in incidence rates based on age, gender, residence, and type of malignancy. Therefore it's suggested that in addition to promote data collecting programs, research projects should be programmed to define leukemia and lymphoma risk factors in this province.

Radiographic manifestations of fibroblastic osteosarcoma: A diagnostic challenge

Tahmasbi-Arashlow, Mehrnaz,Barnts, Kelcie Louise,Nair, Madhu K.,Cheng, Yi-Shing Lisa,Reddy, Likith V. Korean Academy of Oral and Maxillofacial Radiology 2019 Imaging Science in Dentistry Vol.49 No.3

Osteosarcoma is the most common primary bone tumor after plasma cell neoplasms. Osteosarcoma has diverse histological features and is characterized by the presence of malignant spindle cells and pluripotent neoplastic mesenchymal cells that produce immature bone, cartilage, and fibrous tissue. Osteosarcoma most frequently develops in the extremities of long bones, but can occur in the jaw in rare cases. The clinical and biological behavior of osteosarcoma of the jaw slightly differs from that of long-bone osteosarcoma. The incidence of jaw osteosarcoma is greater in the third to fourth decades of life, whereas long-bone osteosarcoma mostly occurs in the second decade of life. Osteosarcoma of the jaw has a lower tendency to metastasize and a better prognosis than long-bone osteosarcoma. Radiographically, osteosarcoma can present as a poorly-defined lytic, sclerotic, or mixed-density lesion with periosteal bone reaction response. Multi-detector computed tomography is useful for identifying the extent of bone destruction, as well as soft tissue involvement of the lesion. The current case report presents a fibroblastic osteosarcoma involving the left hemimandible with very unusual radiographic features.

The Relationship between Mental Toughness and Sport Motivation in Elite and non-Elite Athlete Students

( Farshid Tahmasbi ),( Hassan Abdi ),( Mohammad Taheri Hossin Abad ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: Mental Toughness in sport is a relatively new and growing area of sport psychology research, having caught the imagination of both the general sporting public and the academic community. The purpose of this study was to explore the relationship between Mental Toughness and Sport Motivation in elite and non-elite athlete students. Method: The study populations Consist of elite and non-elite athlete students of Iran, in 2013-2014 year. Selection Method of the study sample was not random but was available samples in sport fields. Participants consisted of 64 athletes students (27 female and 37 male). Two questionnaires involve Mental Toughness and Sport Motivation was used. The data were analyzed by correlation and regression in a descriptive research design. Result: The results revealed significant correlations between Mental Toughness and Sport Motivation. Mental Toughness was significantly and positively correlated to Sport Motivation. However, athletes who scored high on Mental Toughness attributes were significantly higher in Sport Motivation and differ than athletes in the middle and low Mental Toughness score. Conclusion: Results concluded support for using the measure of Mental, Emotional, and Bodily Toughness in the field of psychological skills and sport performance in competitions.

Geochemistry and formation of tourmaline nodules in Mashhad leucogranite, Iran

Zahra Tahmasbi,Farhad Zal,Ahmad Ahmadi Khalaji 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.3

Nodular tourmalines composed of dark cores and white haloes occur in the Mashhad leucogranite. The cores are made up of tourmaline and quartz, and the haloes of quartz, muscovite, microcline and orthoclase. The host granite consists of quartz, plagioclase, microcline, muscovite and biotite. Geochemical analyses show that the studied tourmalines are schorl. They are characterized by oscillatory zoning, increasing concentrations of Ca and Mg from core to rim, moderate Fe/Fe + Mg ratios (56–63), and REE distribution patterns similar to those of the host granite. The tourmalines exhibit high Ti content due to breakdown of biotite. Petrographic and geochemical results show that the formation of tourmaline can be attributed to two stages. In the first stage, bubbles containing vapor-rich liquid, Fe, and B were generated by magma differentiation. During rise and cooling of the magma, core tourmaline was produced with Fe rich schorl composition. In the second stage, the tourmaline composition changed to that of Mg rich schorl because of the decomposition of biotite (biotite is considered as a source of Mg), and the mixing with vapor-rich liquid in bubbles.

Radiographic manifestations of fibroblastic osteosarcoma: A diagnostic challenge

Mehrnaz Tahmasbi-Arashlow,Kelcie Louise Barnts,Madhu K. Nair,Yi-Shing Lisa Cheng,Likith V. Reddy 대한영상치의학회 2019 Imaging Science in Dentistry Vol.49 No.3

Osteosarcoma is the most common primary bone tumor after plasma cell neoplasms. Osteosarcoma has diverse histological features and is characterized by the presence of malignant spindle cells and pluripotent neoplastic mesenchymal cells that produce immature bone, cartilage, and fibrous tissue. Osteosarcoma most frequently develops in the extremities of long bones, but can occur in the jaw in rare cases. The clinical and biological behavior of osteosarcoma of the jaw slightly differs from that of long-bone osteosarcoma. The incidence of jaw osteosarcoma is greater in the third to fourth decades of life, whereas long-bone osteosarcoma mostly occurs in the second decade of life. Osteosarcoma of the jaw has a lower tendency to metastasize and a better prognosis than long-bone osteosarcoma. Radiographically, osteosarcoma can present as a poorly-defined lytic, sclerotic, or mixed-density lesion with periosteal bone reaction response. Multi-detector computed tomography is useful for identifying the extent of bone destruction, as well as soft tissue involvement of the lesion. The current case report presents a fibroblastic osteosarcoma involving the left hemimandible with very unusual radiographic features.

Radiographic manifestations of Mönckeberg arteriosclerosis in the head and neck region

Mehrnaz Tahmasbi-Arashlow,Sevin Barghan,Deeba Kashtwari,Madhu K. Nair 대한영상치의학회 2016 Imaging Science in Dentistry Vol.46 No.1

Mönckeberg sclerosis is a disease of unknown etiology, characterized by dystrophic calcification within the arterial tunica media of the lower extremities leading to reduced arterial compliance. Medial calcinosis does not obstruct the lumina of the arteries, and therefore does not lead to symptoms or signs of limb or organ ischemia. Mönckeberg sclerosis most commonly occurs in aged and diabetic individuals and in patients on dialysis. Mönckeberg arteriosclerosis is frequently observed in the visceral arteries, and it can occur in the head and neck region as well. This report describes a remarkable case of Mönckeberg arteriosclerosis in the head and neck region as detected on dental imaging studies. To the best of our knowledge, this is the first case that has been reported in which this condition presented in the facial vasculature. The aim of this report was to define the radiographic characteristics of Mönckeberg arteriosclerosis in an effort to assist health care providers in diagnosing and managing this condition.

Magnetic Nanoparticle Immobilized N-Propylsulfamic Acid as a Recyclable and Efficient Nanocatalyst for the Synthesis of 2H-indazolo[2,1-b]phthalazine-triones in Solvent-Free Conditions: Comparison with Sulfamic Acid

Rostami, Amin,Tahmasbi, Bahman,Yari, Ako Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5

N-Propylsulfamic acid supported onto magnetic $Fe_3O_4$ nanoparticles (MNPs-PSA) was used as an efficient and magnetically recoverable catalyst for synthesis of 2H-Indazolo[2,1-b]phthalazine-1,6,11(13H)-trione derivatives from the three-component, one-pot condensation reaction of phthalhydrazide, aromatic aldehydes and cyclic 1,3-diones, in good to excellent yields at $100^{\circ}C$ under solvent-free conditions. The catalyst was easily separated with the assistance of an external magnetic field from the reaction mixture and reused for several consecutive runs without significant loss of its catalytic efficiency. In order to compare, the synthesis of 2H-Indazolo[ 2,1-b]phthalazine-1,6,11(13H)-trione derivatives in the presence of catalytic amount of sulfamic acid (SA) under same reaction condition was also reported.

Statistical Voice Activity Detection Using Continues Hidden Markov Model

S. Rezaei,R. Tahmasbi 장전수학회 2011 Proceedings of the Jangjeon mathematical society Vol.14 No.3

This paper presents a novel method for identifying regions of speech based on the Continues Hidden Markov Model. Probably the most difficult problem faced when using HMMs is that of specifying the model parameters. The Baum-Welch algorithm is a method for estimating model parameters. Unfortunately, for large HMMs, multiplying many probabilities always yields very small numbers that will give underflow errors on any computer. We solve this problem by applying the Baum-Welch algorithm on the small segments of the observed noisy speech vector, based on the statistical approaches. The proposed algorithm estimates model parameters, recursively.Emissions probability distributions are assumed to be Variance Gamma (VG) and Gaussian distributions for speech and non-speech states, respectively.The simulation results show that the proposed Voice Activity Detection (VAD) is able to operate down to -5 dB and in nonstationary environments.