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Biomedical subjects

D Tack

Publications and source records attributed to D Tack.

At least 19 recordsLinked to original sources
PubMed2001

[Multislice computed tomography in clinical practice].

This paper presents our first experience with multislice computed tomography emphasizing our technical protocols. Between November 1999 and October 2000, 8086 multislice computed tomographic examinations were performed. The choice in collimation, pitch, slice width and increment, multiplanar reconstructions and contrast enhancement were adapted to provide high resolution in the Z axis, high speed acquisitions and low exposure to the patient. Filming and archiving parameters are also detailed. Multislice CT provides excellent 3D imaging with high speed acquisitions and lower doses than previously reported with single slice CT.

Clinical Protocols↗
PubMed2000

Spontaneous lung herniation after a single cough.

Herniation of the lung is commonly caused by congenital rib abnormalities, blunt trauma, or thoracic surgery. Spontaneous hernias are rarely described in the literature. We report a case of a spontaneous intercostal pulmonary hernia following a single cough. In addition, a review of the literature is presented which outlines the classification, causes, and incidence of lung hernias. Some reference is made to possible methods of treatment.

Acute Disease↗
PubMed2000

The CT fallen-lung sign.

On chest radiograph, the diagnosis of tracheobronchial tear is usually suspected because of the persistence of a pneumothorax after chest tube insertion. Since this radiographic pattern is nonspecific, the diagnosis is usually made by bronchoscopy and delayed. The fallen-lung sign consists in the fall of the collapsed lung away from the mediastinum occurring when the normal central bronchial anchoring attachment of the lung is disrupted. In contrast to the persistent pneumothorax, this sign is specific but rarely observed. Our purpose is to present the corresponding CT patterns observed in two cases of right stem bronchus tear, consisting in a caudal-dependent displacement of the right upper lobe bronchus which becomes obliquely oriented.

Accidents, Traffic↗
PubMed2000

Helmet accommodation analysis using 3D laser scanning.

A method used to determine the probable population accommodation of a helmet sizing system is described. The method involves the use of 3D laser scanning, as a means of measuring helmet standoff distance (distance between the inside of the helmet and the skull), and the selection of a representative sample of test subjects. The laser scanner and the software developed to calculate standoff distance proved to be an excellent tool for the assessment of helmet fit. The main advantages include ease of use and visualization of problem areas. This 3D-analysis method gives designers objective evidence of the need for design changes as well as an idea of what these changes should be. A comparison was made between standoff distance results obtained from the scanner and those obtained using a physical measurement method (a probe). Although discrepancies were found between the two, sources of errors intrinsic to both methods make it difficult to determine which of the two methods yielded the truest standoff distance. Analysis of the comparison data shows laser scanning to be slightly more conservative than the probe method for standoff distance purposes, i.e. erring on the side of safety.

Cephalometry↗
PubMed2000

[CT-xray demonstration of a vertical vein].

Congenital anomalies of the thoracic veins are infrequent but important developmental disorders. Anomalies of the systemic thoracic veins usually are asymptomatic but may be associated with other more serious cardiovascular abnormalities and complicate their management. We present a case of a vertical vein consisting in an abnormal venous drainage from the left upper pulmonary lobe to the superior vena cava, resulting in a non cyanotic shunt.

Humans↗
PubMed2000

[Unsuspected hepatic rupture with peritoneal extravasation of contrast media revealed by computed tomography].

Computed tomography (CT) plays a major role as the initial diagnostic tool in adult blunt abdominal trauma. Indications of CT are hemodynamical instability, abdominal defense and high-speed deceleration. We present the case of a 22 year-old man involved in a motor-vehicle accident admitted in our emergency department with headache but without clinical signs of intraabdominal trauma. The abdominal CT was asked because of the high-speed deceleration and because the patient had to come to the CT room for a head CT. The abdominal multislice helical CT performed with contrast bolus injection showed a massive intraperitoneal extravasation from a hepatic laceration and avulsion. The patient died during operation despite immediate management of the abdominal traumatic lesions detected by CT.

Abdominal Injuries↗
PubMed1999

The SERRATE locus controls the formation of the early juvenile leaves and phase length in Arabidopsis.

The development of the shoot can be divided into a series of distinct developmental phases based on leaf character-istics and inflorescence architecture. The relationship between phase length, defined by the number of organs produced, and the timing of the floral induction (V3-I1 transition) is relatively ill defined. Characterization of the serrate mutant (CS3257; Arabidopsis Biological Research Center) revealed defects in both vegetative and inflores-cence phase lengths, the timing of phase transitions, leaf number, the leaf initiation rate, and phyllotaxy. The timing of floral induction, however, is the same as in wild-type in extended short days as well as in short days, whereas the flowering time response to photoperiod is unaffected. SERRATE is shown to be required for the development of early juvenile leaves (V1) and to promote late juvenile leaf development (V2), while suppressing adult leaf (V3) and inflorescence development (I1 and I2). The se mutation supports the hypothesis that the timing of floral induction is independent of vegetative and inflorescence phase lengths. The role of SERRATE in the regulation of phase length and leaf identity is discussed.

Arabidopsis↗
PubMed1999

[Spiral computed tomography of the renal arteries].

With the recent advent of spiral or helical CT, the ability to acquire large volume of imaging has become possible. Fast scanning of both kidneys, the aorta and the renal vessels can be accomplished during one breathhold. Early reports of CT angiography in the evaluation of renal artery stenosis indicated a sensitivity of 92% utilizing the MIP projection method and 59% utilizing the shaded surface display method. Specificity for both method was approximately 82%. More recent articles reports for hemodynamically relevant renal artery stenosis a sensitivity/sensibility of 96/99%. The introduction of a new multidetector CT technology will probably increase those results and the indication of CT angiography.

Angiography↗