Biomaterial Database

Normalized average glandular dose in molybdenum target-rhodium filter and rhodium target-rhodium filter mammography. 1994

X Wu, and E L Gingold, and G T Barnes, and D M Tucker

Department of Radiology, University of Alabama Hospital and Clinics, Birmingham 35233-1924.

OBJECTIVE To determine the normalized glandular dose (DgN) for molybdenum target-rhodium filter (Mo-Rh) and rhodium target-rhodium filter (Rh-Rh) mammography and compare the average glandular doses (Dg) that resulted with a conventional molybdenum target-molybdenum filter (Mo-Mo) source assembly. METHODS X-ray spectra models for Mo-Rh and Rh-Rh were developed and used to calculate DgN values for these target-filter combinations as a function of x-ray tube potential, half-value layer, and breast thickness for three breast compositions. For the average glandular dose comparisons, 50/50 phantoms were imaged for the three target-filter source assemblies at three tube potentials. RESULTS For the same parameters, DgN values for Mo-Rh and Rh-Rh were higher than for Mo-Mo. At the same voltage, the exposures required to image breast phantoms are substantially lower, and as a result, Dgs are also less with Mo-Rh and Rh-Rh than with Mo-Mo. CONCLUSIONS DgN values presented permit practical evaluations of average glandular doses for Mo-Rh and Rh-Rh mammography. At a given potential, dose savings are realized with Mo-Rh and Rh-Rh source assemblies.

UI	MeSH Term	Description	Entries
D008327	Mammography	Radiographic examination of the breast.	3D-Mammography,Digital Breast Tomosynthesis,Digital Mammography,X-ray Breast Tomosynthesis,3D Mammography,3D-Mammographies,Breast Tomosyntheses, Digital,Breast Tomosyntheses, X-ray,Breast Tomosynthesis, Digital,Breast Tomosynthesis, X-ray,Digital Breast Tomosyntheses,Digital Mammographies,Mammographies,Mammographies, Digital,Mammography, Digital,X ray Breast Tomosynthesis,X-ray Breast Tomosyntheses
D008961	Models, Structural	A representation, generally small in scale, to show the structure, construction, or appearance of something. (From Random House Unabridged Dictionary, 2d ed)	Model, Structural,Structural Model,Structural Models
D008982	Molybdenum	A metallic element with the atomic symbol Mo, atomic number 42, and atomic weight 95.95. It is an essential trace element, being a component of the enzymes xanthine oxidase, aldehyde oxidase, and nitrate reductase.	Molybdenum-98,Molybdenum 98
D011829	Radiation Dosage	The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).	Sievert Units,Dosage, Radiation,Gray Units,Gy Radiation,Sv Radiation Dose Equivalent,Dosages, Radiation,Radiation Dosages,Units, Gray,Units, Sievert
D011835	Radiation Protection	Methods and practices adopted to protect against RADIATION.	Protection, Radiation
D001940	Breast	In humans, one of the paired regions in the anterior portion of the THORAX. The breasts consist of the MAMMARY GLANDS, the SKIN, the MUSCLES, the ADIPOSE TISSUE, and the CONNECTIVE TISSUES.	Breasts
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000273	Adipose Tissue	Specialized connective tissue composed of fat cells (ADIPOCYTES). It is the site of stored FATS, usually in the form of TRIGLYCERIDES. In mammals, there are two types of adipose tissue, the WHITE FAT and the BROWN FAT. Their relative distributions vary in different species with most adipose tissue being white.	Fatty Tissue,Body Fat,Fat Pad,Fat Pads,Pad, Fat,Pads, Fat,Tissue, Adipose,Tissue, Fatty
D012238	Rhodium	A hard and rare metal of the platinum group, atomic number 45, atomic weight 102.905, symbol Rh.	Rhodium-103,Rhodium 103