Abstract: A nitroimidazole derivative represented by the following formula (1): [wherein R1 represents a hydrogen atom or a C1-C4 alkanoyl group; and X represents a fluorine atom or an isotope thereof], and a diagnostic imaging agent containing the derivative as an active ingredient. The derivative enables imaging of the ischemic sites of a circulatory organ or imaging of cancer cells, and thus the derivative can provide information about the position and the amount of the ischemic sites or the cancer cells. Therefore, the derivative contributes to selection of appropriate treatment of ischemia or cancer.

Abstract: A label printer includes a printing head having a plurality of heating elements arranged in a direction perpendicular to the feed direction of a label, and a data generator for supplying a plurality of article data, including a bar code and a price, to the printing head in the ordinary printing mode. In the test mode, the data generator supplies to the printing head test pattern data indicative of a plurality of test patterns which are printed in substantially the same positions as the printing positions of those plurality of article data, each of the test patterns having an area of substantially the same size as the largest one of the areas occupied by the article data to be printed in the same printing position.

Abstract: A thermal-printing device prints by selectively supplying a current to a plurality of heat generating elements in accordance with printing data. In a check mode, the thermal-printing device sequentially supplies a check current to the heat generating elements through a light-emitting diode and a current-limiting resistor.